The Boeing SUGAR team was one of four that received contracts from NASA in 2008 to study subsonic concepts for the 2030 to 2035 timeframe. The Boeing subsonic team, which includes BR&T, Boeing Commercial Airplanes, General Electric and Georgia Tech, has looked at five concepts as part of the SUGAR (Subsonic Ultra Green Aircraft Research) project. The concepts include two conventional reference configurations, similar in appearance to a 737 (nicknamed SUGAR Free and Refined SUGAR), two versions of a new design high span, strut-braced wing aircraft (referred to as SUGAR High and SUGAR Volt), and a hybrid wing body configuration (called SUGAR Ray).