Old Story. Cessna 172 requesting altitude/speed check from airport in So. Cal. Cessna 172 we have you @ 120 knots @ 7500ft. Next twin engine asks for same 12,000 and 270 knots. USAF pilot asks just to top them, F-16 we have you @ 55,000 and 650 knots He felt satisfied. Then another request was heard and reply was 80,000 and Mach 2.6. Wonder what that could have been? No other request was heard. Ha.Ha.