Helicopter Sikorsky H-19A Chickasaw Serial 55-126 Register 51-3870 used by US Air Force USAF. Built 1952. Aircraft history and location Aircraft History 51-3870 US Air Force 1952-04-21Sikorsky S-55 c/n 55-126, ff:? del USAF as H-19A, 51-3870, 21Apr52. 1952-08-15 w/o 15aug52 in Japan Send Updates Use APP to upload photo @ (optional) When Now? / / Send