The Scaled Composites Model 133-4.62 ATTT, or Advanced Technology Tactical Transport was a technology demonstration project built by Burt Rutan's Scaled Composites in 1986 under contract to DARPA.
In 1986, DARPA placed a contract with Scaled Composites, a company set up by Burt Rutan and owned by Beechcraft to build prototypes for advanced aircraft, for a 62% scale proof-of-concept demonstrator for the concept, called the Advanced Technology Tactical Transport (shortened to ATTT or AT3).
[1][2] The ATTT had high-aspect ratio tandem wings, joined by long nacelles which carried the aircraft's tractor configuration turboprop engines, large fuel tanks, and the main undercarriage units for the aircraft's retractable tricycle landing gear.
A novel arrangement of eight fast acting fowler flaps was fitted, inboard and outboard of the engines on each of the wings.
[3] The ATTT demonstrator made its maiden flight on December 29, 1987 from Mojave Airport, base of Scaled Composites.