Regardless of feasbibility, if it this registration is genuine and is using existing vehicles - then those vehicles will need to be adapted to suit the bags, suitcases and luggage that an airport bus will need/expect to carry.
The luggage racks on a Versa will struggle to fit one suitcase, never mind several.
From experience, the bulk of flight arrivals (particularly scheduled or chartered) & departures arent in the middle of the day either - so the service would need to have an extensive rota.
Personally speaking, if I lived in Sunderland and had just got off a flight (whether it was during the day or at night), the last thing I would want to do, would be jumping on a bus and having a tour of Newcastle's suburbs and South Tyneside before rocking up at Park Lane 2 hours later, to then have to make some sort of change to get home...
RE: Go North East