I was told a long time ago when I was a spotty ATC cadet that the Shackleton song started life as the Lancaster song. Likewise I believe the Nimrod song started life in Coastal Command during the last war, the obvious subjects being either the Sunderland, Liberator or Catalina.
I had a book once, that was sadly pinched from me by a RAFP, that was full of WW2 songs. The ones that stuck in my mind were the Airborne Song ( ........he hit the ground the sound was splat..........Glory Glory what a helluva way to die.....) and 487 Sqn's song from their time in the WD, also to Marlene Dietriche's famous song.