Add-on – A selection, typically at an increased price, added to a travel reservation.
Adjoining rooms – Bordering hotel rooms that do not share a common door.
Advance purchase requirement – Ticket must be purchased a minimum number of days before the flight departs.
ARC – The Airlines Reporting Corporation - is responsible for supervising payments from travel agencies to airlines along with the manner in which tickets are issued to consumers.
Airport access fee – A fee paid to the airport authority by car rental companies for the use of shuttle vehicles. This often appears in customer’s car rental bills.
Availability – The total number of seats allowed to be sold at a particular rate.
Cancellation penalty – A fee to charged to customers that cancel flights after booking reservations. Fees typically vary based on the agency or carrier.
Commission – A small fee that a travel agency or services adds to the total fee in order to make money.
Consolidator – A business that has contracts with airlines to sell tickets in bulk, generally at a discounted rate.
Corporate agency – A travel agency that usually caters to medium-large sized businesses.
Electronic ticket – A paperless ticket that allows travelers to fly with only a photo ID. Commonly referred to as "E-ticket's", they cannot be lost or stolen because it is an electronic reservation.
Exclusive fare – Discounted airfares offered by travel consolidators.
Global distribution system (GDS) – An international computer reservation system that accesses many databases of suppliers, airlines, etc. in different countries, such as Sabre.
IATAN – International Airlines Travel Agent Network - Administers the IATAN card, the only widely accepted form of legitimate travel agent identification.
Interline connection – A trip with a connection flight from a different airline.
Maximum stay – The longest period of time a traveler can stay at a particular destination and still qualify for the promotion or discounted fare.
Minimum connect time – The shortest time required in order to successfully transfer to a connecting flight. It is recommended to select a connecting flight that exceeds the minimum connection time.
Modified American plan (MAP) – Meal plan that includes two daily meals, usually breakfast and dinner.