I thought it was based on arrival time. At least, I'm pretty sure it is here.
We track on time departure in the US, and it's based on when they push back from the gate.
On time arrival is probably tracked too, and my guess is that it's based on touchdown time given that's usually closer to when my ticket says we're supposed to land then when we actually arrive at the gate and start to get off.
I suspect airlines care far less about the arrival time since there are so many factors out of their control like weather or being bumped in landing priority by the air traffic controllers.
We track on time departure in the US, and it's based on when they push back from the gate.
On time arrival is probably tracked too, and my guess is that it's based on touchdown time given that's usually closer to when my ticket says we're supposed to land then when we actually arrive at the gate and start to get off.
I suspect airlines care far less about the arrival time since there are so many factors out of their control like weather or being bumped in landing priority by the air traffic controllers.