The Bell Huey was the first mass-produced helicopter powered by a jet turbine. With its distinctive whomp-whomp sound that could be heard miles away, the UH/AH-1 aircraft have totaled more than 27 million flight hours since Oct. 20, 1956 when the granddaddy of all H-1's, the XH-40, made its first flight. Since then, more than 16,000 H-1 helicopters have been produced by Bell and its licensees -- making it the most successful military aircraft in aviation history 
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