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Flight-time equivalent dose (FED) is an informal unit of measurement of ionizing radiation exposure. Expressed in units of flight-time (i.e., flight-seconds, flight-minutes, flight-hours), one unit of flight-time is approximately equivalent to the radiological dose received during the same unit of time spent in an airliner at cruising altitude.
In airport gate assignment methods, to optimize gate utilization. [ 6 ] In elevator control, to minimize the average waiting time or journey time of passengers [ 7 ] [ 8 ] ( destination dispatch ).
Airport check-in is the process whereby an airline approves airplane passengers to board an airplane for a flight. Airlines typically use service counters found at airports for this process, and the check-in is normally handled by an airline itself or a handling agent working on behalf of an airline.
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As of November 9, 2020, Singapore Airlines Flights 23 and 24 is the world's longest active commercial flight between Singapore and New York–JFK, covering 15,349 km (9,537 mi; 8,288 nmi) in around 18 hours and 40 minutes, operated by an Airbus A350-900ULR.
However flight plans may be submitted up to 120 hours in advance either by voice or by data link; though they are usually filled out or submitted just several hours before departure. The minimum recommended time is one hour before departure for domestic flights, and up to three hours before international flights.
Since 2003, the United States Bureau of Transportation Statistics has been keeping track of the causes of flight delays. [6] The number of flight delays has increased as staff has been cut back as a result of the financial woes following the September 11 attacks. [7] Some of the causes of flight delays or cancellation include: Airline glitches.