This paper presents noise data obtained during recent tests of the prototype of the British Comet 4 airliner in take‐offs from the De Havilland plant at Hatfield, England. The data are analyzed in terms of noise levels, spectrum distribution, and noise duration and are compared with related data obtained from tests with several propeller‐driven airliners. Measurement positions were located at points under the take‐off path corresponding to residential areas near present‐day airports. This work was sponsored by the Port of New York Authority.