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

A wind that blows in the same direction as the course of an aircraft, increasing its groundspeed and reducing travel times.

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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