M
- Mach number
- machine-readable travel documents
- macroburst
- magnetic brake
- magnetic compass
- magnetic variation
- magneto
- main drive shaft
- main landing gear
- main rotor
- main rotor blade
- main rotor head
- maintenance
- maintenance organization’s procedures manual
- maintenance programme
- maintenance records
- maintenance release
- major modification
- major overhaul
- major repair
- making way
- maneuvering area
- maneuvering speed
- manifest
- manifold pressure
- manned free balloon
- marker
- marker beacon
- marking
- marshaller
- mass rescue operation
- mast
- mast nut
- master cylinder
- master minimum equipment list
- master rod
- maximum certificated take-off mass
- maximum continuous power
- maximum gross weight
- maximum landing gear operating speed
- maximum landing weight
- maximum performance takeoff
- maximum ramp weight
- maximum take-off thrust
- maximum take-off weight
- maximum weak-mixture power
- maximum zero fuel weight
- mayday
- mean aerodynamic chord
- mean sea level
- mean time between failure
- mean time between maintenance
- mean time to repair
- medical assessor
- medical certificate
- medical examiner
- medium frequency
- medium intensity approach light system with runway alignment indicator lights
- memorandum of understanding
- Mercator projection
- meridional index
- metadata
- METAR code
- meteorologic front
- meteorological briefing
- meteorological centre
- meteorological element
- meteorological information
- meteorological instrument
- meteorological message
- meteorological observation
- meteorological observing station
- meteorological report
- meteorological satellite
- meteorological service
- meteorological watch office
- metre
- microburst
- microwave landing system
- mid-air collision
- mid-wing monoplane
- middle marker
- mike
- minimum control speed
- minimum control speed on the ground
- minimum crew
- minimum crossing altitude
- minimum descent altitude
- minimum en-route altitude
- minimum equipment list
- minimum flying speed
- minimum fuel
- minimum glide path
- minimum holding altitude
- minimum obstacle clearance altitude
- minimum reception altitude
- minimum safe altitude
- minimum sector altitude
- minimum vectoring altitude
- minor overhaul
- minor repair
- mishandled baggage
- missed approach
- missed approach holding fix
- missed approach point
- missed approach procedure
- missed approach segment
- mist
- mixed-flow turbine
- MLAT system
- mode (SSR)
- moderate drizzle
- modification
- mole
- momentum separation
- monoplane
- monopulse secondary surveillance radar
- motor glider
- moustache
- movement area
- moving target indicator
- multi-crew pilot licence
- multi-engine aeroplane
- multi-engined
- multi-engined helicopter
- multi-pilot aircraft
- multi-sensor navigation system
- multifunctional display