[Porsche-O-Phile]

Also, consider that once the aircraft vacates the gate it was assigned to, it's almost impossible to get back there. Gate rental costs are quite expensive and airlines go through great pains to ensure that there is an aircraft parked there almost continuously. Once your plane-load of people pushes back, there are probably two or three other planes in line that want that gate. You'd have to taxi to a remote part of the airport, have someone deliver a jet stair, deplane everyone, then if ATC happens to call you back saying "we have your clearance" and your passengers are who-knows-where and it's going to take you forever to get ready to depart, you just lost THAT slot as well. Big $$$