The ratio of true airspeed to the speed of sound; e.g., MACH .82, MACH 1.6.
Source FAA Pilot/Controller Glossary · checked 2026-08-25
The ratio of true airspeed to the speed of sound; e.g., MACH .82, MACH 1.6.
Source FAA Pilot/Controller Glossary · checked 2026-08-25