» For other uses, see NC 4 (disambiguation). The NC-4 was a Curtiss NC flying boat, designed by Glenn Curtiss and manufactured by Curtiss Aeroplane and Motor Company. In May 1919 the NC-4 became the first aircraft to fly across the Atlantic Ocean, making the crossing as far as Lisbon in 19 days, with multiple stops along the way. The accomplishment was largely eclipsed in public memory by the first non-stop trans-Atlantic flight, lasting 15 h 57 min, made by British pilots Alcock and Whitten-… (More on Nc-4)