After the war Alcock became a test pilot for Vickers and took up the challenge of attempting to be the first to fly directly across the Atlantic. Alcock and Arthur Whitten Brown took off from St John's, Newfoundland, at 1:45 pm local time on 14 June 1919, and landed in Derrygimla bog near Clifden, Ireland, 16 hours and 12 minutes later on 15 June 1919 after flying . The flight had been much affected by bad weather, making accurate navigation difficult; the intrepid duo also had to cope with turbulence, instrument failure, and ice on the wings. The flight was made in a modified Vickers Vimy bomber and won a £10,000 prize (£ in ) offered by London's "Daily Mail" newspaper for the first non-stop flight across the Atlantic.