Question: What year was the crossing that the Daily Mail Trans-Atlantic Air Race is commemorating?
Related documents: [0]  [DOC] British aviators John Alcock and Arthur Brown made the first non-stop transatlantic flight in June 1919. They flew a modified First World War Vickers Vimy bomber from St. John's, Newfoundland, to Clifden, Connemara, County Galway, Ireland. The Secretary of State for Air, Winston Churchill, presented them with the "Daily Mail" prize for the first crossing of the Atlantic Ocean by aeroplane in "less than 72 consecutive hours". A small amount of mail was carried on the flight, making it the first transatlantic airmail flight. The two aviators were awarded the honour of Knight Commander of the Most Excellent Order of the British Empire (KBE) a week later by King George V at Windsor Castle. [END] 
[1]  [DOC] The Daily Mail Trans-Atlantic Air Race was a race between London and New York City to commemorate the 50th Anniversary of the first trans-atlantic crossing by John Alcock and Arthur Brown. [END] 
Answer: 
1919
1919