" My vote would be the P-38. But I don't believe there are any "in the air" anymore..."
The P38 had a problem with high altitude in cold climates which is why it wasn't used much in Germany. Carburator froze. Fact. Look it up. That said, it was a great plane against the Japanese in WWII, but a little slow for today I would think.
The Brits ordered some P-38's from us. They foolishly elected to get them without superchargers. The performance was lacking. That, too, was a failed experience for the P-38 in Europe.