Plymouth
Surely the angle here is to dump the airline for whatever they can get, then close Plymouth Airport as it would by default become completely non-viable. That then allows them to to turn the land (right in the centre of town) into commercial or residential property, whereupon Sutton Harbour Group will make far more than could ever be possible from running either an airline or an airport? Any ops in that part of the world can relocate to Newquay or Exeter perhaps.