Helicopter Sikorsky H-19B Chickasaw Serial 55-754 Register 53-4418 used by US Air Force USAF. Built 1954. Aircraft history and location Aircraft History 53-4418 US Air Force 1954-08-10Sikorsky S-55 c/n 55-754, ff:? del USAF as H-19B, 53-4418, 10Aug54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send