*No Variant assigned
Sikorsky H-19A Chickasaw
Sikorsky S-55A (UH-198, UH-19D, CH-19E, UH-19F)
Sikorsky S-55C (UH-19C, HRS-1)
November 10, 1949
First flight of the prototype (YH-19) of the Sikorsky S-55/H-19 type series
July 31, 1952
First transatlantic helicopter flight completed (Sikorsky H-19A)
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