Helicopter Sikorsky YH-19 Serial 55-004 Register N74126 49-2015 used by US Air Force USAF. Built 1950. Aircraft history and location Aircraft History 49-2015 US Air Force 1950-08-25Sikorsky S-55, c/n 55-004, ff:? del USAF as YH-19, 49-2015, 25Aug50, status unk. N74126 - ex 49-2015 Send Updates Use APP to upload photo @ (optional) When Now? / / Send