He was forwarded to the Royal Air Force for seasoning, and was assigned to 24 Squadron on 5 July 1918.

On 22 August, he shared his first win with fellow ace William Lambert and other pilots, driving a Fokker D.VII.

The next day, Bair and Horace Barton cooperated in the destruction of an Albatros reconnaissance plane.

[2] In World War II, Hilbert Bair returned to service in the U.S. Army Air Force as a lieutenant colonel.

[3] Above the Trenches: a Complete Record of the Fighter Aces and Units of the British Empire Air Forces 1915-1920.