Model 299
YB-17
YB-17A
B-17B
B-17C
B-17D
B-17E
B-17F
B-17F-BO
B-17F-DL
B-17F-VE
B-17G Memphis Belle
B-17G-BO
B-17G-DL
B-17G-VE
Fortress III
XB-38
YB-40
C-108 Flying Fortress
F-9 Flying Fortress
BQ-7 Aphrodite
PB-1 and PB-1W
SB-17G and PB-1G
YB-17
YB-17A
B-17B
B-17C
B-17D
B-17E
B-17F
B-17F-BO
B-17F-DL
B-17F-VE
B-17G Memphis Belle
- CB-17G. Troop transport version, capable of carrying 64 troops.
- DB-17G. Drone variant.
- JB-17G. Engine test-bed.
- QB-17L. Target drone.
- QB-17N. Target drone.
- RB-17G. Reconnaissance variant.
- SB-17G. Rescue version, originally designated B-17H. Featured A-1 lifeboat under fuselage.
- TB-17G. Special duty training version.
- VB-17G. VIP transport.
- PB-1. This designation was given to one B-17F and one B-17G. They were used by the U.S. Navy for various test projects.
- PB-1G. This designation was given to 17 B-17Gs used by U.S. Coast Guard as air-sea rescue aircraft.
- PB-1W. This designation was given to 31 B-17Gs used by the U.S. Navy as the first airborne early warning aircraft/ AWACS.
B-17G-BO
B-17G-DL
B-17G-VE
Fortress III
XB-38
YB-40
C-108 Flying Fortress
- XC-108B-17E converted to VIP transport standard for General Douglas MacArthur.
- YC-108B-17F converted to VIP transport standard for General Douglas MacArthur.
- XC-108AB-17E converted to cargo or troop transport standard.
- XC-108BB-17F converted for service as a tanker.Two other cargo transports and VIP transports were made from the B-17.
- CB-17G Troop transport version capable of carrying up to 64 troops, 25 built.
- VB-17G VIP transport version for high level staff officers, 8 built.
F-9 Flying Fortress
BQ-7 Aphrodite
PB-1 and PB-1W
SB-17G and PB-1G