Charles Lindburgh made a more famous crossing some years later , but Alcock and Brown were first.
first
NON STOP flight, the US navy (NC-4, commanded by Albert C. Read to be exact) were first to fly planes from one side to the other the month before (3 started, one finished), although they flew over in stages and with a heck of a lot of more support, they went from newfoundland, azores, lisbon, then up to the UK
and fun fact, NC-4 is actually owned by the Smithsonian Institution and it currently on display in the Naval Aviation Museum, Pensacola Florida