On June 14, 1919, British aviators John Alcock and Arthur Whitten Brown took off from near St. John’s, Newfoundland, in a modified Vickers Vimy. On June 15 they landed near Clifden in County Galway, Ireland, completing the first nonstop flight across the Atlantic Ocean.
The achievement must be distinguished from other transatlantic firsts. The U.S. Navy flying boat NC-4 had completed a transatlantic journey in May 1919 with intermediate stops. Alcock and Brown made the first nonstop crossing. Charles Lindbergh’s 1927 achievement was the first solo nonstop flight across the Atlantic. Each record describes a different accomplishment.
Their Vimy was derived from a twin-engine bomber designed during the First World War. For the Atlantic attempt, military equipment was removed and additional fuel capacity installed. The aircraft depended on two Rolls-Royce engines and carried enough fuel for a crossing in which there would be virtually no safe diversion once far from land.
Brown served as navigator. Celestial navigation required a visible horizon and stars or sun, but much of the crossing took place in cloud and fog. The crew had only limited instruments compared with later long-range aircraft, and the wireless equipment failed early in the flight.
Weather repeatedly threatened the attempt. Contemporary accounts describe dense fog, cloud and icing. Ice accumulated on the aircraft and instruments, forcing Brown to climb out of the cockpit more than once to clear critical surfaces. At one point the aircraft lost stable attitude in cloud and descended dangerously before Alcock recovered after the sea became visible.
The flight lasted a little more than sixteen hours. Contemporary and later institutional sources give slightly different minute totals depending on the timing convention used, so TransitSatellite should avoid claiming that one minute figure is the only possible value. The RAF records 16 hours 27 minutes; contemporary Nature reporting calculated about 16 hours 15 minutes from its quoted departure and landing times.
Near Clifden, Alcock selected what looked like a suitable field for landing. It was actually soft bog. The Vimy nosed over and was damaged, but both men survived without serious injury. Their arrival therefore completed the nonstop crossing even though the landing damaged the aircraft.
The flight won the £10,000 Daily Mail prize, and both aviators were knighted. More important for transportation history, it demonstrated that a landplane could make a direct ocean crossing, while also exposing the enormous risks created by weather, navigation uncertainty, communications failure and limited instrument flying capability.
For TransitSatellite, the route should connect the documented departure area near St. John’s with the Clifden landing area as an approximate reconstructed crossing. There is no continuous GPS-quality track. The story is strongest when the uncertainty in the airborne path is made visible rather than hidden behind a perfectly smooth line.