I see that "Starfighters" based at Cape Canaveral are allowed, by the FAA, to operate supersonically when on contract to NASA. I remember hearing of an Iraeli 747 inadvetrantly going supersonic on a flight test.
So BA, Air France, possibly an Israeli crew, Virgin Galactic, an Austrian parachutist the 'Starfighters' (although in a civilian owned ex-military aircraft) and Andy Green. Anybody else?