Alternate airport means an airport, specified on a flight plan, to which a flight may proceed when a landing at the point of first intended landing becomes inadvisable. Approach means the flightpath established by the FAA to be used by aircraft landing on a runway. Approach control facility means a terminal air traffic control facility providing approach control service. Arrival means any aircraft arriving at an airport. Criteria means the standards used by the FAA for the determination of establishment or discontinuance of a service or facility at an airport.
Departure means any aircraft taking off from an airport.
Establishment means the provision of a service or facility at a candidate airport. Instrument approach means a series of predetermined maneuvers for the orderly transfer of an aircraft under instrument flight conditions from the beginning of the initial approach to a landing, or to a point from which a landing may be made visually. It is prescribed and approved for a specific airport by competent authority. In some instances, the signals received from the ground can be fed into the automatic pilot for automatically controlled approaches. Life cycle benefits means the value of services provided to aviation users over the life span of a facility or service.