Actually, I agree with Skipness. I would think that if the terminal was closed and probably demolished to save the on-going costs that would still exist if it was just mothballed, then with a mix of cargo, tech stops, crew training etc Prestwick could just about wash its face financially or at least stem its losses considerably. I think under those circumstances it would be short sighted to close the whole airport - no one in aviation wants to see a 9,800 foot runway lost.