Les gave it to him in the Iranian President thread.
Anyway I would develop the Whirlwind more as well as the MB-5. It would of been interesting to see some of the flying wings that were being designed seeing some service, like the Horten Go 229 for Germany and the flying pancake for the USA. Further development into the early jets I would of done as well to get them in service earlier than they were. Some of the developments to the Spitfire (I think it was Jabberwocky) mentioned I would of done as well, to create a more capable aircraft. The are probably others but I will need to look around and find some more things I think could of done with further development.
Anyway I would develop the Whirlwind more as well as the MB-5. It would of been interesting to see some of the flying wings that were being designed seeing some service, like the Horten Go 229 for Germany and the flying pancake for the USA. Further development into the early jets I would of done as well to get them in service earlier than they were. Some of the developments to the Spitfire (I think it was Jabberwocky) mentioned I would of done as well, to create a more capable aircraft. The are probably others but I will need to look around and find some more things I think could of done with further development.