Experimental aircraft reached Mach 1.1 as program moves closer to demonstrating quiet supersonic flight

Executive order orders FAA to lift supersonic speed limit, as long as the aircraft does not produce an audible sonic boom. Regulation was imposed in 1973 and prevented Concorde from flying over territory above the speed of sound

Capable of flying at more than 2,000 km/h, the airliner was unique in shortening distances and envisioning a future that did not materialize