An excerpt from the article reads:

Pilots, like attorneys, bill by the hour but it’s not quite as simple. Flight crews, pilots and flight attendants, are paid by the flight hour at most U.S. airlines and cargo carriers. Flight hours, known officially as block time, are recorded from the time an airplane leaves the gate, to the time the airplane arrives at a gate. (At most airlines, releasing the parking brake prior to pushing from the gate are considered to be leaving the gate, even if the actual pushback is delayed due to traffic congestion.)

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