In May 1947, Lynch was promoted to Flight Lieutenant.
In 1951, Lynch left the RAF and emigrated to the United States, taking up a role as Airline Flight Operation Officer.
But in 1962 when his children were denied access to a largely white Long Island elementary school, he took the school district to court. The failure of the case inspired Lynch to become “one of Long Island’s most ardent and audacious civil rights activists.
In 1967, Lynch joined the New York Urban Coalition as Vice President and formed the Alliance of Minority Group Leaders. In the 1970s he taught community organisation and activism at Stony Brook University and testified before Congress.
In August 1944 he was promoted to Flight Sergeant, a rare promotion for a gunner. In September 1944 he was awarded the Distinguished Flying Medal. The citation noted his “high standard of determination and devotion to duty”, exemplary conduct and declared him “a worthy member of a fine crew” who had “defended his aircraft with great skill on several occasions against enemy fighters”.