Helicopter Sikorsky S-55 Serial 55-880 Register N742A used by CalCo (California Company). Built 1955. Aircraft history and location Aircraft History N742A CalCo 1955-04-07Sikorsky S-55 c/n 55-880, ff:? del CalCo as N742A, 07Apr55 status unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send