List of X-1 flights
The Bell X-1 was the first crewed airplane to exceed the speed of sound in level flight and was the first of the X-planes.
The Bell X-1 was the first crewed airplane to exceed the speed of sound in level flight and was the first of the X-planes.
The Bell X-1 was the first crewed airplane to exceed the speed of sound in level flight and was the first of the X-planes.
Source: Wikipedia "List of X-1 flights" · CC BY-SA 4.0
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