I think we shouldn't take the word "Duel" too strictly. The idea behind that Campaign is to get two members to work together and to share a common experience.
So, as I said before, if the planes didn't shot at each other, it's not a problem. But they should have been rivals in a way or another! I won't allow a Duel between a Pearl Harbor Zero and a D-Day Spitfire for example. Nore would I allow a duel between the Red Baron and an Airbus A380! :-)
Jean-Luc
