The period or season when flying insects are most active, or in aviation, the actual time spent flying.
Compound of 'fly' and 'time,' referring to either when flies are active or the duration of an aircraft in flight. The aviation usage became standard in the 20th century.
Pilots track their flytime meticulously because it's their resume—experienced pilots have thousands of hours, and there's a special moment called '1,000 hour pilot' that marks expertise!
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