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"Scheduled departure time" is not a term used in the operational environment. It is a term you will find on the passenger side of things, and means the time at which the aircraft is scheduled to leave the departure gate. There are several different operational terms related to departure time: ETD, Estimated time of departure. The estimated time at ...


They are both the same. That definition "ready to start/pushback" in the block quote is pretty much the same as leaving the gate, since leaving the gate is the pushback.

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