That's why I never set the parking brake on arrival, I just hold them until they tell me the chocks are in, then release them, and of course the beacon is on until the door is opened.

On pushback, I release the parking brake a few minutes before pushback and hold them agian, and as soon as I can talk to the tug guy and ask him if we are hooked up I let go, so as soon as the door is closed and the beacon is on, we're getting paid, as it should be.