Small Transport Aircraft Technology, originally published in 1980 provides information on commuter airline trends and aircraft developments, and presents the results and conclusions of the full set of completed STAT studies. Five airplane manufacturers, five engine manufacturers, and two propeller manufacturers performed these studies.This report also summarized portions of NASA?s overall aeronautics research and technology programs which are applicable to commuter aircraft design, and suggests areas of technology that might beneficially be expanded or initiated to air and encourage U.S. commuter aircraft manufacturers in their evolution of improved aircraft for this market.