On that basis it would be better to ban all cars from coming anywhere near the terminals and provide a dedicated remote drop-off/pick-up area. You could then remove parking from the terminals making future remodelling easier too. Essentially have the public entrance to the airport for non-public transport users as a completely separate facility. Perhaps build a skyscraper sized multi-storey car park on top of Wythenshawe Bus Station. /sarcasm mode
Wythenshawe has an Interchange, not a bus station - but that's another story for another thread.