B-17 Flying Fortresses, including (serial number 42-97519) nicknamed "Spirit of Billy Mitchell", of the 91st Bomb Group fly in formation during a mission. Written on slide casing: '91st BG.'
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- Aircraft Type: B-17 Flying Fortress
- Nicknames: Spirit of Billy Mitchell
- Unit: 91st Bomb Group The Ragged Irregulars 401st Bomb Squadron