In my book, approximately fifty years have passed since World War 3. My characters will find an abandoned military airfield, filled with a bunch of aircraft, built circa 1940 - 1960. Obviously, having been abandoned and basking in radioactive fallout for half a century, none of the planes are operable in their discovered condition. Could these planes be repaired and made airworthy again? What kind of effort would it take to do so? Would it be a monumental task requiring lots of manpower and resources, or could a moderate-sized crew of engineers do it on their own? How much of the original aircraft could be retained, and what parts might definitely not be usable and need to be replaced? What conditions might be favourable to the preservation of the aircraft? If the airfield were surrounded by mountains and hills, could that help keep away some of the radiation that could damage the planes? Would planes stored in hangars all that time be in better condition than ones that were left more exposed? Are there certain types of planes, perhaps ones built by certain manufacturers, that might stand a better chance of surviving?