Helicopter Sikorsky H-19B Chickasaw Serial 55-798 Register 53-4444 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4444 US Air Force 1954-11-03Sikorsky S-55 c/n 55-798, ff:? del USAF as H-19B, 53-4444, 03Nov54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send