Suppose someone was willing to give a modern air force a bunch of
planes from WWII. The Luftwaffe can have several hundred
Fw-190s. The US can have a pile of Catalina's (or DC-3s). The British can
have as many Mosquitoes as they want.

Are there any WWII aircraft that could still be useful in a modern
war? Can a Fw-190 compete with an A-10/AH-64 if we're giving
away Fw-190s? Can a B-29 do the same mission as an MC-130,
if we're giving away B-29s but you still have to maintain them?

Is there any WWII aircraft that would still be useful today?