What is block hour in ACMI lease?
Block time starts when the aircraft is pushed back from the gate, and ends when it arrives at the corresponding gate.

It is the total time the aircraft is in use, typically only calculated for revenue movements.

Imagine a flight:


Pushback 1000
Taxi 1030
Takeoff 1035
Touchdown at destination airport 1445
Taxi to gate 1500


Total block time is 5 hours