The Sikorsky S-29-A was an all-metal, twin-engine biplane airliner, first flown in 1924. It was the first aircraft that aviation pioneer Igor Sikorsky designed and built after coming to the United States, hence the special "-A" suffix signifying "America". The pilot and mechanic sat in an open cockpit between the upper wing and the tail, while up to 16 passengers were accommodated within the streamlined fuselage.