Proving the Flying Fortress

As a result of the General Staff's decision, only 13 YB-17s and one YB-17A were ordered by mid-1937 as compared to 133 B-18s and 177 B-18As. The Air Corps was determined to prove the value of the four-engine B-17 with this handful of service test planes. It flew its YB-17s at every opportunity over the U.S. and even scheduled good will flights to South America to demonstrate the long-range capabilities of the plane. It eventually proved its point, and by the end of 1938, contracts for 39 additional B-17Bs were awarded. In addition, a new four-engine bomber, the Consolidated XB-24, was ordered on March 30, 1939. At the time World War II began in Europe in September 1939, the first B-17Bs were beginning to come off the production line.

Click here to return to the Four-Engine Bomber Overview.

Screening at Entrance
All visitors may be screened with a metal detector upon entry. In addition all bags are subject to search and may be placed through an X-Ray machine. Weapons are not permitted including pocket knives and firearms, to include conceal carry and other dangerous weapons.
Prohibited Items
Prohibited Items:
- Firearms*
- Knives
- Box cutters
- Food and Soda Drinks
- Alcohol
- Coolers

* Firearms, to include conceal carry and other dangerous weapons, are specifically prohibited in Federal facilities in accordance with 18 USC §930 (c)

Permitted Items:
- Water bottles (clear, sealed bottle, up to 20 oz.)
- Purses
- Camera bags
- Diaper bags
- Strollers
- Service animals

Please note the National Museum of the U.S. Air Force is not responsible for items left in vehicles.
Click here for frequently asked questions regarding items permitted inside the museum.
Visitor Photography Notice
Notice: Visitors may be filmed, photographed or recorded by the U.S. Air Force for educational and promotional uses, including for posting on public websites and social media.
Individuals are permitted to take their own photographs or videos while touring the museum.