St Athans used to manage some mean Battle of Britain days in it's past, but is a bit off the beaten track..........
AND......with a commercial airport within spiting distance - no chance what so ever!
Exscribbler is spot on with Leeming.
Next to the A1, accessible for both Southerners (providing the Customs people at Wetherby allow you into our County) and far Northerners (Scotch Corner Customs for you).
Good size runway, ample hardstandings/disused runways for car parking/static aircraft, excellent local breweries and the Northern HAS site a wow for the party!!
AND......with a commercial airport within a longer spiting distance - no chance what so ever!
This process has been done before (1999 for RIAT 2000&2001 at RAF Cottesmore) - I think it more likely they would go back to plan B rather than than having to invent plan C.
BUT
Is this just not a case of "tactical arm twisting" by TP to get the yanks to allow car parking on base during RIAT??.
I think this is nearer the mark.