Rahvusvaheline Tsiviillennunduse Organisatsioon määratleb lennuaega järgmiselt: „Koguaeg alates hetkest, mil lennuk stardi eesmärgil liigub, kuni hetkeni, mil ta lennu lõpus lõplikult seisab“, ning hõlmab seega aega, mis kulub ruleerimisele ja lennueelsele kontrollile maapinnal, tingimusel et mootor töötab; kommertslennunduses tähendab see aega väljumisväravast väljumisest sihtväravasse jõudmiseni.
Flight time is defined by International Civil Aviation Organization as "The total time from the moment an aeroplane first moves for the purpose of taking off until the moment it finally comes to rest at the end of the flight", and thus includes time spent taxiing and performing pre-flight checks on the ground, provided the engine is running; it is colloquially referred to as "block to block" or "chock to chock" time; in commercial aviation, this means the time from pushing back at the departure gate to arriving at the destination gate.
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