Two U.S. research pilots evaluated the Tupolev Tu-144 supersonic transport aircraft on three dedicated flights: one subsonic and two supersonic profiles. The flight profiles and maneuvers were developed jointly by Tupolev and U.S. engineers. The vehicle was found to have unique operational and flight characteristics that serve as lessons for designers of future supersonic transport aircraft. Vehicle subsystems and observed characteristics are described as are flight test planning and ground monitoring facilities. Maneuver descriptions and extended pilot narratives for each flight are included as appendices. da asymmetric elevon (aileron) deflection de symmetric elevon (elevator) deflection AC alternating current ACM air cycle machine ADI Attitude Director Indicator AGL above ground level AOA angle of attack APU Auxiliary Power Unit A/T autothrottle CG center of gravity DC direct current DME Distance Measuring Equipment EGT exhaust gas temperature FE flight enginee..