After working in the de Havilland design and aerodynamics departments, Fairbrother joined the company's new flight test department in 1948.
On 27 July 1949, the Comet 1 made its historic 31-minute maiden flight.[3] On board were the de Havilland chief test pilot, John Cunningham, co-pilot John Wilson, and flight test observer Tony Fairbrother. Fairbrother was quoted as commenting that: "The Comet must have been one of the all-time technical achievements. I don't think it is too much to say that the world changed from the moment its wheels left the ground."[4]