I'm curious how the shorter legs worked, such as the Washington to Miami (also Dallas at one point?) flight. Did it go supersonic on a 'shorter' flight? Was there a minimum leg distance needed for the Concorde to fly supersonic? And was there an 'optimum' altitude when it was only subsonic? Could it fly comfortably (fuel efficient) at Mach One point something as opposed to 2.0 where I thought it was probably designed to operate?