A published altitude representing the maximum usable altitude or flight level for an airspace structure or route segment. It is the highest altitude on a Federal airway, jet route, area navigation low or high route, or other direct route for which an MEA is designated in 14 CFR part 95 at which adequate reception of navigation aid signals is assured.

Listed in the Pilot/Controller Glossary as a cross-reference to MAXIMUM AUTHORIZED ALTITUDE, whose text is shown above.

Source FAA Pilot/Controller Glossary↗ · checked 2026-08-25