Helicopter Sikorsky H-19B Chickasaw Serial 55-466 Register 51-3958 used by US Air Force USAF. Built 1953. Aircraft history and location Aircraft History 51-3958 US Air Force 1953-07-07Sikorsky S-55 c/n 55-466, ff:? del USAF as H-19B, 51-3958, 07Jul53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send