- MAC
Mid-air collision
- MANPADS
Man Portable Air Defense Systems
- MAP
Manifold Absolute Pressure or Missed Approach Point
- MAP
Missed Approach Point
- MATS
Manual of Air Traffic Services
- MB
Marker Beacon
- MCBF
Mean Cycles Between Failures
- MDA
Minimum Decent Altitude
- MDA/H
Minimum Descent Altitude/Height
- MEDEVAC
Medical Evacuation
- MEF
Maximum Elevation Figure
- MEL
Minimum Equipment List
- METAR
Meteorological Aerodrome Report (METAR)
- MF
Medium Frequency
- MFD
Multi-Function Display
- MFDS
Multi-Function Display System
- MIC
Microphone
- MILSPEC
Military Specification
- MITA
Multilateral Interline Traffic Agreements
- MKR
Marker Beacon or Marker[disambiguation needed]
- MLS
Microwave Landing System
- MLS
Microwave Landing System
- MLS
Microwave Landing System
- MM
Middle Marker
- MM
Middle Marker
- MMD
Moving Map Display
- MNPS
[Minimmum Navigation Performance Specifications
- MOA
Military Operations Area
- MOC
Minimum Obstacle Clearance
- MOT
Ministry of Transport (various countries)
- MOU
Memorandum of Understanding
- MP
Manifoil Pressure
- MRO
Maintenance Repair Overhaul
- MSA
Minimum Safe Altitude / Minimum Sector Altitude
- MSG
Message
- MSL
Mean Sea Level
- MSP
Modes S Specific Protocol
- MSSS
Mode S Specific Services
- MTBF
Mean Time Between Failures
- MTOW
Maximum Take-Off Weight
- MTTF
Mean Time To Failure
- MZFW
Maximum Zero-Fuel Weight
- Mode A
Transponder pulse code reporting
- Mode C
Transponder code and altitude reporting
- Mode S
Transponder code, altitude, and TCAS reporting
