The Brits used the Mustang operationally in fact first labeled the P51 the Mustang.
Americans used Spitfires at the very start of the entry of the United States.
In these cases there was alot more than 1 or 2 used. Along the same lines, the Brits used the Corsair from carriers after we had just about given up on it.
Originally posted by thebest1
Theres and Spitfire with american symbols and a P51D with british! Y CANT MINE BE INNN!