Aileron
A control surface located on the trailing edge of each wing tip. Deflection of these surfaces controls the roll or bank angle of the aircraft.
Airfoil
Any surface such as an airplane wing, aileron, or rudder designed to obtain a useful reaction from the air moving past it.
Airworthiness
A term used to describe both the legal and mechanical status of an aircraft with regard to its readiness for flight.
Altimeter
An instrument which displays the altitude above mean sea level (MSL) of an aircraft.
Artificial Horizon
An instrument which enables a pilot to determine the attitude of the aircraft in relation to the horizon, i.e. whether the aircraft is nose-up, nose-down, or banking left or right.
Available Seat Mile (ASM)
One seat flown one mile. An airliner with 100 passenger seats, flown a distance of 100 miles, represents 10,000 available seat miles (ASMs).
Aviation Trust Fund
Fund established by Congress to pay for improvements to the nation's airports and air traffic control system. Money in the fund comes solely from users of the system - primarily a tax on domestic airline tickets.
Cargo
Anything other than passengers, carried for hire, including both mail and freight.
Cockpit Voice Recorder (CVR)
A device that records the sounds audible in the cockpit, as well as all radio transmissions made and received by the aircraft, and all intercom and public address announcements made in the aircraft. It generally is a continuous loop recorder that retains the sounds of the last 30 minutes.
Codesharing
A marketing practice in which two airlines share the same two-letter code used to identify carriers in the computer reservation systems used by travel agents.
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