[Kocur]

This is a list of planes that could have realistically seen production and done quite well in combat in a war that was harder on the Americans.

P-67A-1MD - 1944

The Mac Donnel XP-67 Moonbat refitted with either a Packard V-1650 engine or an Allison V-1710 engine with two-stage supercharger in front of each engine nacelle and an GE I-20 turbojet or a Westinghouse 9.5" turbojet in the rear of each nacelle and a new gun selection of either 6 or 8x.50cal machine guns making a high-speed, long-range, and high maneuverability fighter that could have gone into immediate production.

XP-67 with jet engines never got further than "talk" ( http://home.att.net/~jbaugher1/p67.html ), no way it could have been produced in 1944.

The production configuration of the Douglas XB-42A Mixmaster.

What do you mean "production configuration"...? XB-42 never had any "production configuration" and that particular one couldn't be further away from production, as it was made for purely experimental purposes and flew in March 1947 ( http://home.att.net/~jbaugher2/b42.html ).

The production model of the Curtiss XF15C.

Same thing, there was no such thing as "production model" of that plane.

The production model of the lightened and rearmed Consolidated YP-81 Silver Bullet.

Someone's fantasy again... YP-81s were never made ( http://home.att.net/~jbaugher1/p81.html ).