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All throughout WWII.
B52 B1B B17 B24
perhaps you mean the 'flying fortress' a B17 bomber
Boeing B17
The B17, B24, and B29s were the heavy bombers of WWII. The B52 was the heavy bomber of the Vietnam War.
It was the Flying Fortress, dubbed so by a Seattle journalist and later adopted as the official name.
The B52 Stratofortess. During the Vietnam War, one B52 could carry up to 108 750lb HE bombs. That was equal to about 10 World War 2 B17 bombers.
main = primary or most obvious flaw = a weakness He was a satisfactory leader, but his main flaw was a weakness for women.
On a B17 bomber the spent shell casings (brass) fell on the floor. Everything was scarce and rationed during WWII so I assume the brass was reused.
The Boeing B-17 was a US Army Air Corps four-engine bomber with heavy defensive machine-gun armament and a crew of 10. Hundreds of them were used to bom German-occupied lands at that time.
1 h 21 min (104.1 km) via B17 and B17
B17 is a relative reference. $B$17 is an absolute reference. See the related question below.