Before the U.S. entered WW2 on December 7 1941 American pilots volunteered to fly for the Royal Air Force in the defence of England. Most started with the Hawker Hurricane but soon advanced to the Supermarine Spitfire Mk.Vc pictured below in the American Eagle markings. While most of the volunteers moved back to the U.S. when we entered the war alot of them stayed in England.
Next we have the De Havilland DH98 Mosquito. While a versatile fighter and Bomber the one below is a 1946 model and painted in U.S. markings for the D-Day invasion with the black and white stripes on its wings, still pretty cool.