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International Air Transport Association - a trade association of the world’s airlines that helps formulate industry policy and standards.

Federal Aviation Administration - the governmental body responsible for regulating all aspects of civil aviation in the United States.

Global Distribution System - a computerized network system used by travel agencies that provides real-time inventory and rates for hotels, flights, and car rentals.

Passenger Name Record - a code used in the travel industry that contains the itinerary for a passenger, or a group of passengers traveling together.

A unique 3-letter code used to identify airports and cities for ticketing and baggage handling.

The most basic and least expensive class of service offered by an airline.

The process of or time needed for loading, unloading, and servicing an aircraft between two consecutive flights.

An arrangement between two airlines where one airline markets a flight operated by another airline under its own airline designator and flight number.

Extended-range Twin-engine Operational Performance Standards - regulations that allow twin-engine aircraft to fly routes that, at some points, are more than 60 minutes away from the nearest airport suitable for emergency landing.

Products sold to international travelers exempt from taxation by the country of departure.

Aircraft staff responsible for the comfort, safety, and welfare of passengers during a flight.

An international radio distress signal used by aircraft and ships in life-threatening emergencies.

A crew member who is traveling in a passenger seat but is not working on that flight.

A passenger who fails to board and take their reserved seat on a flight without prior notice.

A loyalty program that offers rewards to passengers who travel often with the same airline.

An airport that an airline uses as a transfer point to get passengers to their intended destination.

A period of rest or wait, often overnight, between segments of a longer journey where a change of planes is required.

A flight departing late at night and arriving early the next morning, usually taking off after 9 pm and landing by 5 am.

A variable pricing strategy based on understanding, anticipating, and influencing passenger behavior to maximize revenue from a fixed, perishable resource (seats).

An aircraft with a cabin wider than 5 meters, allowing multiple aisles.

The services provided to an aircraft while it is on the ground including operations such as baggage loading, aircraft cleaning, and refueling.

When an airline asks for volunteers to give up their seats on an overbooked flight in exchange for compensation.

A service provided by ground-based controllers who direct aircraft on the ground and through controlled airspace.

Compressed air taken from gas turbine engines, which is used for a variety of aircraft functions, such as de-icing, cabin pressurization, and air conditioning.

An electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents.

The shortest legal allowable time between scheduled arrival of an incoming flight and the scheduled departure of a connecting flight.

An emergency exit located over the wings of an aircraft, used for passenger egress if an evacuation is necessary.

The airport area where aircraft are parked for boarding and deplaning, as well as for loading and unloading cargo.

A specific scheduled time when an airline can either takeoff or land at a particular airport.