Not a large airline by any means and not one that is going to be around for much more than a month or two more.
But Sutton Harbour Holdings until recently owned both Plymouth airport and Air Southwest so i can only assume it is allowed.
SHH recently sold SZ (for lack of other words) to Eastern. And now recently announced that they intend to close Plymouth airport.
Air Southwest is in the process of being closed down by Eastern.
This is the problem when development companies get hold of airports and airlines, more money to be made by flogging the land for housing
cs