According to Official Guinness Records,
The first crossing of the North Atlantic by air was made by Lt Cdr (later Rear Admiral) Albert Cushing Read (1887-1967) and his crew (Stone, Hinton, Rodd, Rhoads and Breese) in the 155 km/h (84-knot) US Navy/Curtiss flying-boat NC-4 from Trepassey Harbor, Newfoundland, Canada via the Azores, to Lisbon, Portugal from 16-27 May 1919. The whole flight of 7,591 km (4,717 miles), originating from Rockaway Air Station, Long Island, New York, USA on 8 May, required 53 hr 58 min, terminating at Plymouth, Devon on 31 May.
For a complete list of 1919 records, please visit 1919 Guinness Records in Canada.