The first flight of the B-17 Flying Fortress — a heavy bomber built by Boeing that was instrumental in U.S. bombing campaigns during World War II — occurred on July 28 of which year?
1921
1927
1931
1935
1942
The correct answer is 1935
The first flight of the B-17 Flying Fortress — a heavy bomber built by Boeing that was instrumental in U.S. bombing campaigns during World War II — occurred on July 28 of which year?
1921
1927
1931
1935
1942
The correct answer is 1935