Field studies have been performed to provide experimental data on noise intrusion into community areas from aircraft flight operations. Air traffic activity over selected community areas in the vicinity of two air bases was determined from analysis of air base flight movements and from field observations. Flight paths, pattern altitudes, climb profiles, and engine power changes were determined from aircraft tracking observations, from interrogation of flight and operations personnel, and from special logs prepared by crew members on aircraft in flight. Noise from flyovers observed at ground locations was recorded in synchronization with position data. Simplified prediction models were formulated from the experimental data, and these were used, together with previously developed procedures, to describe the noise intrusion. This paper describes the types of data obtained and discusses significant experimental findings on flight activity variations, flight path variations, and time patterns of sound pressure level observed on the ground for aircraft flyovers. Conclusions drawn from the experimental data on sound propagation from aircraft to ground and on the effects of jet aircraft speed on noise generation are also discussed. Several indices used in the description of aircraft noise intrusion are defined. [This work was supported in part by the U. S. Air Force under Contract Nos. AF 33(616)‐3335 and AF 33(616)‐3938.]