(aviation, usually in the plural) A device that measures and displays data concerning one or more aspects of the situation of an aircraft, such as its altitude, attitude, airspeed, etc.

plural of death flight

(nautical) The person at the foiling controls to operate the hydrofoils on a boat or ship / (aviation) An air traffic controller

plural of top flight

(aviation) A device which records various performance parameters of an aircraft; it is designed to survive severe impact and fire, and, thus, help in finding the causes of an accident.

(philately) a philatelically inspired letter flown on the first flight of a new airline service.

plural of first flight cover

(aviation) A substitute ticket issued by an airline due to a schedule change or other disruption to their service, allowing travel on another airline.

plural of flight data recorder

(aviation) A usually-unintentional crash of an aircraft in which the aircraft flies into the ground while under full control by its pilots or autopilot.