Helicopter Sikorsky H-19A Chickasaw Serial 55-125 Register 51-3869 used by US Air Force USAF. Built 1952. Aircraft history and location Aircraft History 51-3869 US Air Force 1952-04-16Sikorsky S-55 c/n 55-125, ff:? del USAF as H-19A, 51-3869, 16Apr52. 1952-09-18 w/o 18sep52 in Korea Send Updates Use APP to upload photo @ (optional) When Now? / / Send