I do it too. I rotate usually between the Bf-109, P-47, Spitfire I or V, Hurricane, and P-40E. Occasionally I get it for a Pony, P-38, Mossie or Fw, but those are rare. Its usally the Jug or 109, and ALWAYS comes back to the Messerschmitt after a few weeks. And with bombers, its ALWAYS the B-17, Stuka and He-111, but from time to time I get it for the Boston, B-24, or B-25.