And then there's the Convair B-36 Peacemaker, with 230ft (~70m) wingspan. The last major piston-engind heavy bomber, design was started in 1941, put in service in 1949, and retired in 1959.

https://en.wikipedia.org/wiki/Convair_B-36_Peacemaker

The plane's also notable for having been one of very few operational flying aircraft carrier types - able to carry https://en.wikipedia.org/wiki/McDonnell_XF-85_Goblin