Helicopter Sikorsky H-19B Chickasaw Serial 55-465 Register 51-3957 used by US Air Force USAF. Built 1953. Aircraft history and location Aircraft History 51-3957 US Air Force 1953-07-07Sikorsky S-55 c/n 55-465, ff:? del USAF as H-19B, 51-3957, 07Jul53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send