F

Flight Track and Aircraft Noise Monitoring System (FANOMOS)
This flight track recording system makes it possible to display and evaluate the flight tracks of individual aircraft arriving at or departing from an airport. It is based on radar data and can be used to assess aircraft noise complaints and possible violations of rules.

Foot (ft)
A unit of length defined as 30.48 cm. In aviation, the foot is used globally to measure altitude.

Flight information region (FIR)
A flight information region is an airspace of defined dimensions within which at least flight information service and alerting service are provided. Every portion of the atmosphere belongs to a specific FIR. They usually cover the territory of the relevant country, but may also include international waters (assigned by the ICAO). The airspace over a national territory may also be subdivided into a number of FIRs.

Flight level (FL)
A surface of constant atmospheric pressure corresponding to the level above standard atmospheric pressure, measured in hundreds of feet. Flight level 200, for example, is approximately 20,000 ft (6,000 m) above sea level.

Flight plan (FPL)
A flight plan has to be filed for each flight to be controlled by air traffic control. It contains information about the intended flight, such as the estimated time of departure, requested flight level, destination airport and planned route. The essential flight plan data are contained on a flight-progress strip printed out for air traffic controllers. State-of-the-art air traffic control systems also display these data directly on a visual display unit.