This glossary explains key terminology used by tour operators, online travel agencies, and global distribution systems across the Travel, Transportation & Logistics sector. It helps executives and practitioners navigate the commercial, operational, regulatory, payment, and technology language central to the Travel & Tourism Operators (Tour Operators, OTAs, GDS) Practice.
0–9 A B C D E F G H I J L M N O P R S T U V W
| 0–9 | |
| 3DS | Three-Domain Secure: A card-payment authentication protocol that allows issuers to verify customers during online bookings. It helps travel sellers reduce fraud and meet strong-authentication requirements while managing checkout conversion. |
| A | |
| ABTA | Association of British Travel Agents (The Travel Association): A UK travel trade association that sets member standards, supports consumer protection arrangements, and provides operational and regulatory guidance to travel businesses. |
| ABTOT | Association of Bonded Travel Organisers Trust: A UK financial-protection organization that provides bonding and related insolvency-protection arrangements for qualifying travel organizers, particularly non-flight package providers. |
| ACM | Agency Credit Memo: A document through which an airline credits a travel agency for an adjustment, refund, commission correction, or disputed settlement item, usually through an industry settlement system. |
| ACTA | Association of Canadian Travel Agencies and Travel Advisors: Canada’s national retail travel trade association, representing agencies and advisors through accreditation, education, advocacy, and professional standards. |
| ADM | Agency Debit Memo: A billing notice used by an airline to recover money from an agency for ticketing, fare, tax, refund, commission, or reservation-rule discrepancies. Managing these memos is a significant control activity for air-ticket sellers. |
| ADT | Adult: A standard passenger type used in reservation and fare-pricing systems. The code affects eligibility, fares, taxes, ticketing, and traveler data requirements. |
| AI | All-Inclusive: A package or accommodation board basis that includes lodging, meals, and specified beverages or activities in the quoted price. Exact inclusions must be confirmed because supplier definitions vary. |
| AITO | Association of Independent Tour Operators (The Specialist Travel Association): A UK association representing specialist tour operators and travel agents, with membership requirements covering customer service, financial protection, and responsible tourism. |
| API | Advance Passenger Information: Biographical and travel-document data collected before an international journey and transmitted to border-control authorities. Travel sellers must obtain accurate information and advise customers about submission requirements. |
| API | Application Programming Interface: A defined method for software systems to exchange availability, pricing, content, bookings, payments, and servicing instructions. It is fundamental to connections among suppliers, aggregators, tour operators, and online travel agencies. |
| APIS | Advance Passenger Information System: A government or carrier-enabled system used to collect and transmit passenger identity and document data before departure or arrival. Compliance failures can prevent check-in or expose travel providers to operational disruption. |
| ARC | Airlines Reporting Corporation: The US organization that accredits participating travel agencies and provides airline ticketing, reporting, and settlement services. Its systems and rules are central to US agency air sales. |
| ARI | Availability, Rates, and Inventory: The core data set exchanged between accommodation suppliers and distribution partners. Timely synchronization helps prevent stale prices, closed-room sales, and overbooking. |
| ASTA | American Society of Travel Advisors: A US trade association representing travel advisors, agencies, and related travel companies through advocacy, education, professional development, and industry standards. |
| ATIA | Australian Travel Industry Association: Australia’s national travel trade association, representing travel intermediaries and operators and administering industry accreditation and professional standards. |
| ATOL | Air Travel Organiser’s Licence: A UK licensing and financial-protection regime for businesses selling qualifying flight-inclusive packages and certain flight-only arrangements. Licensed organizers must meet regulatory, reporting, and consumer-protection obligations. |
| ATPCO | Airline Tariff Publishing Company: An industry organization that distributes airline fares, rules, branded-fare data, and related pricing content to distribution and retailing systems worldwide. |
| ATT | Air Travel Trust: The UK trust that supports financial protection for customers of failed licensed travel organizers, including eligible refunds and repatriation costs under the flight-package protection regime. |
| ATTA | Adventure Travel Trade Association: A global membership organization serving adventure-tour operators, destinations, advisors, and suppliers through research, education, standards, and commercial networking. |
| B | |
| BAR | Best Available Rate: A supplier’s generally available flexible rate for a room or travel product at a given time. It is often used as a benchmark for discounts, package rates, and distribution competitiveness. |
| BB | Bed and Breakfast: An accommodation board basis that includes the room and breakfast in the booked price. Tour documentation should specify any restrictions on meal format or eligible occupants. |
| BSP | Billing and Settlement Plan: An airline-industry system that consolidates ticket-sales reporting and financial settlement between accredited travel agents and participating airlines in each market. |
| C | |
| CAA | Civil Aviation Authority: The UK aviation regulator responsible for licensing and oversight of flight-inclusive travel organizers, alongside broader aviation safety and consumer-protection duties. |
| CHD | Child: A passenger type used to apply age-dependent fares, taxes, seating conditions, documentation rules, and service requirements. Applicable age ranges can differ by supplier and product. |
| CNP | Card-Not-Present: A payment transaction in which the physical card is not presented to the merchant, as occurs in most online and telephone bookings. These transactions require strong fraud controls and carry elevated chargeback exposure. |
| CRS | Computer Reservation System: A platform that stores and processes travel availability, rates, reservations, and related servicing data. It may serve an individual supplier or connect inventory to broader distribution channels. |
| CTA | Certified Travel Associate: A professional designation awarded by The Travel Institute to advisors who complete prescribed industry education and experience requirements. |
| CTA | Closed to Arrival: An inventory restriction preventing a customer from beginning a stay on a specified date. A stay that starts earlier may still continue through that date, depending on other controls. |
| CTD | Closed to Departure: An accommodation inventory restriction preventing checkout on a specified date. Distribution systems use it to enforce stay patterns and protect demand on constrained dates. |
| CTM | Circle Trip Minimum: An international fare-construction check that ensures a circle-trip fare is not lower than the applicable minimum derived from comparable component fares. |
| CUG | Closed User Group: A defined, authenticated audience eligible for private travel rates not displayed to the general public. Membership and access controls are important for complying with supplier distribution terms. |
| D | |
| DCC | Dynamic Currency Conversion: A payment service that lets an international customer pay in the cardholder’s home currency rather than the merchant’s currency. Clear disclosure of exchange rates and fees is essential. |
| DMC | Destination Management Company: A locally based business that contracts and delivers ground services such as transfers, excursions, guides, events, and accommodation for tour operators and travel sellers. |
| DMO | Destination Management Organization: An organization responsible for coordinating tourism strategy, visitor development, promotion, and stakeholder collaboration for a destination. Some markets instead use “destination marketing organization.” |
| DMS | Destination Management System: A technology platform used to manage destination content, supplier inventory, product information, and sometimes booking distribution across tourism stakeholders. |
| DOT | United States Department of Transportation: The federal authority whose consumer-protection rules cover airlines and ticket agents, including areas such as fare advertising, refunds, disclosures, and unfair or deceptive practices. |
| E | |
| ECTAA | European Travel Agents’ and Tour Operators’ Associations: A European umbrella organization representing national associations of travel agents and tour operators in policy, regulatory, and industry discussions. |
| EDIFACT | Electronic Data Interchange for Administration, Commerce and Transport: A United Nations messaging standard long used for structured transactions among airlines, reservation systems, and travel distributors. It remains important in legacy air-distribution infrastructure. |
| EES | Entry/Exit System: A European border system that electronically records entries, exits, and refusal decisions for covered non-EU travelers crossing Schengen external borders. It affects traveler-document guidance and processing expectations. |
| EMD | Electronic Miscellaneous Document: The airline-industry electronic document used to record and settle ancillary services such as baggage, seats, change fees, and other non-ticket items. |
| EMS | Excess Mileage Surcharge: A fare-construction uplift applied when an itinerary’s ticketed mileage exceeds the permitted mileage for the fare, subject to applicable tariff rules. |
| ESTA | Electronic System for Travel Authorization: The US online system through which eligible Visa Waiver Program travelers obtain authorization before traveling to the United States by air or sea. |
| ETA | Electronic Travel Authorisation: A digital pre-travel permission required by some countries for specified visa-exempt visitors. Travel providers commonly surface the requirement during pre-departure communications. |
| ETA | Estimated Time of Arrival: The expected time at which a traveler or service will reach a destination. It is used in itinerary management, transfers, meet-and-greet services, and disruption communications. |
| ETIAS | European Travel Information and Authorisation System: The European pre-travel authorization system for eligible visa-exempt visitors entering participating European countries for short stays. |
| ETKT | Electronic Ticket: A standard reservation-system abbreviation indicating an electronically issued transport ticket rather than a paper document. It appears in booking records, ticketing messages, and servicing workflows. |
| ETOA | European Tourism Association: A trade association representing tour operators, intermediaries, destinations, attractions, and suppliers involved in European inbound and intra-European tourism. |
| ETR | Electronic Ticket Record: The authoritative electronic record containing ticket coupons, status, itinerary, fare, tax, and issuance information used for travel and post-sale servicing. |
| F | |
| FAM | Familiarization Trip: A hosted trip that gives travel sellers, product managers, or media direct experience of a destination or product so they can evaluate and represent it accurately. |
| FB | Full Board: An accommodation board basis that normally includes breakfast, lunch, and dinner with the room. Beverages and other extras may remain chargeable. |
| FIT | Free Independent Travel: Individually arranged travel rather than a fixed escorted group departure. The term often covers customized itineraries assembled from separately contracted or dynamically packaged components. |
| FOC | Free of Charge: A service, room, seat, or group place supplied without charge under a contract or promotion. Tour agreements should state which taxes, fees, or supplements remain payable. |
| FQTV | Frequent Traveler: A reservation-system service code used to transmit a traveler’s loyalty-program details to a carrier. Correct entry supports mileage credit, status recognition, and eligible benefits. |
| G | |
| GBV | Gross Booking Value: The total value of travel booked through a business before deducting supplier costs, cancellations, refunds, or retained revenue. Included taxes and fees vary by company definition and should be stated. |
| GDS | Global Distribution System: A travel marketplace and transaction network that connects agencies and other sellers with airline, hotel, car-rental, rail, and related supplier content. |
| GIT | Group Inclusive Tour: A prearranged package for a defined group, typically combining transport with accommodation and other services under group pricing and conditions. |
| GSA | General Sales Agent: A company appointed to represent and sell a travel supplier’s products in a market where the supplier may lack its own commercial presence. |
| GSTC | Global Sustainable Tourism Council: An international organization that establishes baseline sustainability criteria for destinations and tourism businesses and accredits certification bodies against its requirements. |
| H | |
| HB | Half Board: An accommodation board basis that generally includes breakfast and one additional daily meal, usually dinner. Package descriptions should confirm the meal arrangement and beverage policy. |
| HEDNA | Hotel Electronic Distribution Network Association: A global membership organization focused on electronic accommodation distribution, including connectivity, data standards, payments, content, and commercial practices. |
| HIP | Higher Intermediate Point: An international airfare check that compares the through fare with applicable fares to or from intermediate points and raises the fare when tariff rules require it. |
| I | |
| IAR | Interactive Agent Reporting: The Airlines Reporting Corporation platform through which accredited US agencies review, reconcile, and submit airline sales and settlement information. |
| IATA | International Air Transport Association: The global airline trade association that administers agency accreditation, settlement systems, ticketing standards, distribution programs, and many passenger-data and messaging specifications. |
| IATAN | International Airlines Travel Agent Network: An industry accreditation and identification program for eligible US travel businesses and qualified personnel, administered within the international airline-association group. |
| IBE | Internet Booking Engine: A customer- or agent-facing application that searches travel content, prices options, creates reservations, and supports online checkout and confirmation. |
| ICCA | International Congress and Convention Association: A global association for suppliers serving international association meetings, providing market intelligence, education, and business-development resources. |
| INF | Infant: A passenger type used for young travelers subject to supplier-specific age, fare, seating, ticketing, and accompaniment rules. |
| IROE | IATA Rate of Exchange: The exchange rate used to convert neutral fare-construction amounts into the currency of payment when pricing international air tickets. |
| IRTS | International Recommendations for Tourism Statistics: The United Nations framework defining concepts and classifications for measuring visitors, trips, tourism expenditure, and tourism industries consistently across countries. |
| ISO 21101 | Adventure Tourism — Safety Management Systems — Requirements: An international standard specifying safety-management-system requirements for adventure-tourism providers, including risk management, operating controls, and continual improvement. |
| ISO 21102 | Adventure Tourism — Leaders — Personnel Competence: An international standard defining expected competencies for leaders responsible for delivering adventure-tourism activities safely and professionally. |
| ISO 21103 | Adventure Tourism — Information for Participants: An international standard covering the information adventure-tourism providers should give participants before, during, and after an activity. |
| ISO 21902 | Tourism and Related Services — Accessible Tourism for All — Requirements and Recommendations: An international standard guiding tourism providers in making services, information, facilities, and customer experiences more accessible. |
| IT | Inclusive Tour: A travel product sold for a combined price that includes transport and one or more additional components, such as accommodation, transfers, or sightseeing. |
| J | |
| JATA | Japan Association of Travel Agents: Japan’s principal travel-agency and tour-operator association, supporting industry standards, consumer protection, training, advocacy, and outbound and inbound tourism development. |
| L | |
| LCC | Low-Cost Carrier: An airline operating a low-fare model that commonly unbundles baggage, seat selection, meals, and other services. Distribution and servicing processes can differ from those of full-service carriers. |
| LOS | Length of Stay: The number of nights or days included in a booking. It is used in pricing, availability controls, package design, and customer-behavior analysis. |
| LRA | Last Room Availability: A negotiated-rate condition under which the agreed rate remains available while the supplier still has an eligible room for sale. Contract definitions determine which room types and controls apply. |
| LTA | Linked Travel Arrangement: A legally defined combination of travel services facilitated through linked purchasing processes but not meeting all requirements of a package. It carries specific disclosure and insolvency-protection obligations in relevant jurisdictions. |
| M | |
| MCC | Merchant Category Code: A card-network classification assigned according to a merchant’s principal business activity. Travel-specific classifications can affect processing costs, fraud treatment, rewards, and chargeback rules. |
| MCO | Miscellaneous Charges Order: A legacy airline document used for residual values, deposits, fees, and services not represented by a passenger ticket. Electronic miscellaneous documents have replaced many uses, but older records may still require servicing. |
| MCT | Minimum Connection Time: The shortest published interval permitted between connecting services at a location for a defined itinerary. Reservation systems use it to assess whether a connection is valid. |
| MICE | Meetings, Incentives, Conferences, and Exhibitions: The travel segment serving corporate meetings, incentive programs, conventions, congresses, and trade exhibitions, often requiring specialized group contracting and destination services. |
| MIDT | Marketing Information Data Tapes: Aggregated reservation data derived primarily from global distribution systems and used to analyze travel demand, booking flows, agency performance, and competitive market share. |
| MLOS | Minimum Length of Stay: An availability rule requiring a booking to cover at least a specified number of nights or days. It is commonly used during high-demand periods or in package contracting. |
| MoR | Merchant of Record: The legal entity that accepts the customer’s payment and is identified in the card transaction. It carries responsibilities for payment processing, refunds, chargebacks, tax treatment, and customer-facing terms. |
| MPM | Maximum Permitted Mileage: The maximum route mileage allowed for an international air fare before an excess-mileage surcharge or different fare construction becomes necessary. |
| MRTD | Machine Readable Travel Document: A passport or other travel document designed to be read electronically in accordance with international specifications. Accurate document capture is essential for passenger-data and border processes. |
| MRZ | Machine Readable Zone: The standardized lines of encoded identity and document information printed on passports and other travel documents for automated scanning and validation. |
| N | |
| NDC | New Distribution Capability: An airline retailing and messaging standard that enables richer offers, dynamic content, ancillary sales, and order servicing between airlines and travel sellers. |
| NTO | National Tourism Organization: A national-level body responsible for tourism development, destination promotion, market intelligence, and coordination with travel-industry stakeholders. |
| NUC | Neutral Unit of Construction: A standardized unit used to construct and compare international air fares before conversion into the ticketing currency. |
| NVA | Not Valid After: The last date on which a ticket coupon or fare component may be used, subject to the ticket’s conditions and any authorized reissue. |
| NVB | Not Valid Before: The earliest date on which a ticket coupon or fare component may be used. The restriction helps enforce fare and itinerary conditions. |
| O | |
| O&D | Origin and Destination: The true starting and ending points of a customer’s journey, regardless of intermediate connections. The concept underpins itinerary pricing, demand analysis, and air-distribution strategy. |
| OAG | Official Airline Guide: A long-established source of airline schedule, flight-status, and aviation market data used in journey planning, distribution, analytics, and competitive analysis. |
| OBT | Online Booking Tool: A self-service platform that allows travelers or arrangers to search and book approved travel content, commonly within managed corporate travel programs. |
| OSI | Other Service Information: Free-form or structured information sent to a carrier within a reservation record for awareness rather than as a request requiring confirmation. |
| OTA | Online Travel Agency: A digital intermediary through which consumers or businesses search, compare, book, and service travel products supplied by third parties or packaged by the retailer. |
| OTA | OpenTravel Alliance: A standards organization that develops interoperable data models and messaging specifications for exchanging travel availability, content, reservations, and servicing information. |
| OW | One-Way: A journey or fare covering travel from an origin to a destination without a return component. Fare rules may price it differently from half of a round trip. |
| P | |
| PATA | Pacific Asia Travel Association: A membership association connecting destinations and travel businesses across the Asia-Pacific region through research, advocacy, sustainability programs, and industry events. |
| PAX | Passenger or Passengers: Widely used travel-industry shorthand for the number of travelers in a booking, movement, group, or operational report. |
| PCC | Pseudo City Code: A global-distribution-system identifier assigned to an agency, branch, office, or booking location. It controls access, ownership, queueing, security, and commercial configuration. |
| PCI DSS | Payment Card Industry Data Security Standard: The security standard governing organizations that store, process, or transmit payment-card data. Compliance is critical for travel businesses handling high volumes of remote payments. |
| PNR | Passenger Name Record: A reservation record containing itinerary, traveler, contact, ticketing, and service information. It is a core operational object for booking, fulfillment, servicing, and regulatory data transmission. |
| PSD2 | Payment Services Directive 2: European payment legislation governing payment providers, customer authentication, and account access. Its authentication requirements materially affect online travel checkout and payment design. |
| PTC | Passenger Type Code: A standardized code identifying the traveler category used for pricing and eligibility, such as adult, child, infant, senior, student, or seafarer. |
| PTD | Package Travel Directive: European Union legislation establishing organizer and retailer obligations for packages and linked travel arrangements, including information, performance, refunds, assistance, and insolvency protection. |
| PTR | Package Travel and Linked Travel Arrangements Regulations: The UK regulatory framework governing package organizers and linked-arrangement facilitators, including pre-contract information, liability, cancellation rights, and insolvency protection. |
| R | |
| RBD | Reservation Booking Designator: The letter or code identifying an airline inventory class. It links seat availability to fares, rules, cabin products, and eligibility conditions. |
| RO | Room Only: An accommodation board basis covering the room without meals. Taxes, resort fees, and other compulsory charges may still be payable. |
| ROE | Rate of Exchange: The conversion factor shown in international ticket fare calculations when neutral fare amounts are converted into the ticketing currency. |
| ROH | Run of House: An accommodation category allowing the property to assign any room within the contracted eligible inventory at check-in, rather than guaranteeing a specific room type. |
| RT | Round Trip: Travel from an origin to a destination and back to the origin, usually under a fare or itinerary constructed as a return journey. |
| RTW | Round-the-World: A multi-stop itinerary that travels around the globe under defined routing, direction, mileage, stopover, and carrier rules. |
| S | |
| SC | Self-Catering: Accommodation that provides facilities for guests to prepare their own meals and does not ordinarily include meal service in the rate. |
| SCA | Strong Customer Authentication: A payment-security requirement using at least two independent authentication factors for covered electronic transactions. It affects online booking flows, exemptions, failed payments, and conversion rates. |
| SF-MST | Statistical Framework for Measuring the Sustainability of Tourism: A United Nations statistical framework for measuring tourism’s economic, environmental, and social dimensions in an integrated and internationally comparable way. |
| SIC | Seat-in-Coach: A shared transfer, excursion, or tour on which customers purchase individual places rather than a private vehicle. Timetables and routing may accommodate multiple bookings. |
| SITI | Sale Inside, Ticketing Inside: An international airfare classification in which both the sale and ticket issuance occur inside the country where international travel commences. |
| SITO | Sale Inside, Ticketing Outside: An international airfare classification in which the sale occurs inside the country of journey commencement but ticket issuance occurs outside it. |
| SOTI | Sale Outside, Ticketing Inside: An international airfare classification in which the sale occurs outside the country of journey commencement but ticket issuance occurs inside it. |
| SOTO | Sale Outside, Ticketing Outside: An international airfare classification in which both the sale and ticket issuance occur outside the country where international travel commences. |
| SSIM | Standard Schedules Information Manual: The airline-industry standard governing schedule-data formats, codes, and messaging. Its formats support schedule loading into distribution and planning systems. |
| SSR | Special Service Request: A coded request placed in a reservation for a service requiring supplier action or confirmation, such as assistance, a special meal, or specific passenger documentation. |
| STPC | Stopover Paid by Carrier: Accommodation, transfers, or related services provided at a carrier’s expense when an itinerary requires an eligible extended connection under the carrier’s policy. |
| SYTA | Student & Youth Travel Association: A travel trade association serving organizations involved in student and youth group travel, with programs covering education, safety, advocacy, and professional standards. |
| T | |
| T&A | Tours and Activities: The travel segment covering attractions, sightseeing, experiences, excursions, and other destination-based products sold before departure or in destination. |
| TASF | Travel Agency Service Fee: A fee charged by an agency for professional services such as research, booking, ticketing, changes, or consultation. Specialized settlement tools may process it separately from supplier charges. |
| TIDS | Travel Industry Designator Service: An international identification program that assigns recognized codes to non-ticketing travel sales intermediaries, helping suppliers identify and manage commercial relationships with them. |
| TMC | Travel Management Company: A business that manages corporate travel programs and transactions, typically combining booking, policy control, traveler support, supplier management, reporting, and consulting. |
| TO | Tour Operator: A business that designs, contracts, combines, prices, and sells travel services as packages or organized itineraries, either directly or through intermediaries. |
| TOMS | Tour Operators’ Margin Scheme: A special value-added-tax regime applying in the UK and certain European contexts to qualifying travel services bought and resold in the operator’s own name. Tax is generally calculated on the margin rather than the full selling price. |
| TPM | Ticketed Point Mileage: The published mileage between ticketed points used in international fare construction to test a routing against its permitted mileage. |
| TSA | Tourism Satellite Account: A statistical framework that measures tourism’s direct economic contribution by linking visitor demand with the industries supplying tourism goods and services. |
| TTCI | Travel & Tourism Competitiveness Index: The former World Economic Forum benchmark comparing the conditions that enabled travel and tourism development across economies. It was succeeded by the development index methodology. |
| TTDI | Travel & Tourism Development Index: A World Economic Forum benchmark assessing factors and policies that support sustainable and resilient tourism development across economies. |
| TTL | Ticketing Time Limit: The deadline by which a reserved itinerary must be ticketed before the booking or quoted fare may be canceled or repriced. |
| U | |
| UATP | Universal Air Travel Plan: An airline-owned payment network used for air travel and related purchases, particularly in corporate travel. It can provide lower-cost acceptance and detailed travel transaction data. |
| UFTAA | United Federation of Travel Agents’ Associations: A global federation representing national travel-agent and tour-operator associations in industry relations, education, and professional development. |
| UMNR | Unaccompanied Minor: A reservation service code for a child traveling without an accompanying eligible adult. Carrier-specific age, documentation, handling, and fee rules apply. |
| UNWTO | United Nations World Tourism Organization: The former public-facing name of the United Nations specialized agency now branded as UN Tourism. Its statistics, policy guidance, definitions, and sustainability programs remain widely referenced. |
| USTOA | United States Tour Operators Association: A US trade association for tour operators and travel suppliers whose active members must satisfy specified professional and consumer-protection requirements. |
| V | |
| VCC | Virtual Credit Card: A digitally generated card credential used for a specific supplier payment, booking, amount, or validity window. Online travel sellers commonly use it to settle accommodation and other supplier obligations securely. |
| VFR | Visiting Friends and Relatives: A major travel-purpose segment covering trips primarily motivated by personal visits. Its booking patterns, seasonality, accommodation use, and destination spending can differ from leisure tourism. |
| VoA | Visa on Arrival: Entry permission issued at a destination’s border or port of entry to eligible travelers. Eligibility, fees, documentation, and permitted stay vary by nationality and destination. |
| W | |
| WTTC | World Travel & Tourism Council: A global membership organization representing private-sector travel and tourism leaders and producing widely used research on the sector’s economic contribution, employment, sustainability, and resilience. |