Helicopter Sikorsky S-55B Serial 55-1003 Register CF-MEV N873 used by Chicago Helicopter Airways. Built 1956. Aircraft history and location Aircraft History N873 Chicago Helicopter Airways 1956-09-18Sikorsky S-55B c/n 55-1003, ff:? del Chicago Helicopter Airways as N873, 18Sep56 sold Canada as CF-MEV, unk. CF-MEV - sold Canada as CF-MEV, unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send