Business aircraft-a nongeneric term to certification authorities-are being given increased attention by national and international bodies concerned with noise reduction. This paper reviews the efforts of these groups from a regulatory standpoint. The status of domestic requirements in the United States and abroad is presented. Technical procedures of promulgated and proposed standards are discussed. Business aircraft are separated into turbojet-powered and propeller-driven categories, and each is presented in terms of recent certification experience. The relationship between domestic certification programs and those of the International Civil Aviation Organization, and between domestic and foreign programs are presented. Finally, a brief look is taken into the future for the efficacy of business aircraft noise certification programs.