The noise fields around several jet aircraft have been measured for various engine operating conditions. Directivity patterns as a function of octave bands of frequency are presented. Acoustic power levels have been computed and found to agree with a previously published correlation of power level with engine operating conditions [O. K. Mawardi and I. Dyer, J. Acoust. Soc. Am.25, 389 (1953)]. Analysis of these data has led to the development of a procedure for estimating the characteristics of the noise fields around non‐afterburner jet aircraft operating at military power.