- Maxwell Air Force BaseIdent: KMXFServes: Montgomery
- MBS International AirportIdent: KMBSServes: Freeland
- Mc Alester Regional AirportIdent: KMLCServes: Mc Alester
- Mc Entire Joint National Guard BaseIdent: KMMTServes: Eastover
- Mc Guire Air Force BaseIdent: KWRIServes: Wrightstown
- McAllen Miller International AirportIdent: KMFEServes: McAllen
- MCAS New River / McCutcheon FieldIdent: KNCAServes: Jacksonville
- McCall Municipal AirportIdent: KMYLServes: McCall
- McChord Air Force BaseIdent: KTCMServes: Tacoma
- McClellan AirfieldIdent: KMCCServes: Sacramento
- McClellan-Palomar AirportIdent: KCRQServes: Carlsbad
- McComb-Pike County Airport / John E Lewis FieldIdent: KMCBServes: McComb
- McConnell Air Force BaseIdent: KIABServes: Wichita
- McCook Ben Nelson Regional AirportIdent: KMCKServes: McCook
- McGrath AirportIdent: PAMCServes: McGrath
- McKellar-Sipes Regional AirportIdent: KMKLServes: Jackson
- McMinnville Municipal AirportIdent: KMMVServes: McMinnville
- Meadows FieldIdent: KBFLServes: Bakersfield
- Mekoryuk AirportIdent: PAMYServes: Mekoryuk
- Melbourne Orlando International AirportIdent: KMLBServes: Melbourne
- Memorial Field AirportIdent: KHOTServes: Hot Springs
- Merced Regional Macready FieldIdent: KMCEServes: Merced
- Mercer County AirportIdent: KBLFServes: Bluefield
- Merle K (Mudhole) Smith AirportIdent: PACVServes: Cordova
- Merrill FieldIdent: PAMRServes: Anchorage
- Mesa Gateway AirportIdent: KIWAServes: Mesa
- Mesquite AirportIdent: K67LServes: Mesquite
- Miami Executive AirportIdent: KTMBServes: Miami
- Miami Homestead General Aviation AirportIdent: KX51Serves: Homestead
- Miami-Opa Locka Executive AirportIdent: KOPFServes: Miami
- Michigan City Municipal AirportIdent: KMGCServes: Michigan City
- Mid Delta Regional AirportIdent: KGLHServes: Greenville
- Mid Ohio Valley Regional AirportIdent: KPKBServes: Parkersburg (Williamstown)
- Mid-Way Regional AirportIdent: KJWYServes: Midlothian/Waxahachie
- Middle Georgia Regional AirportIdent: KMCNServes: Macon
- Midland International Air and Space PortIdent: KMAFServes: Midland
- Miles City Airport - Frank Wiley FieldIdent: KMLSServes: Miles City
- Miley Memorial FieldIdent: KBPIServes: Big Piney
- Miller FieldIdent: KVTNServes: Valentine
- Millington-Memphis AirportIdent: KNQAServes: Millington
- Millville Municipal AirportIdent: KMIVServes: Millville
- Mineral Wells Regional AirportIdent: KMWLServes: Mineral Wells
- Minot Air Force BaseIdent: KMIBServes: Minot
- Minot International AirportIdent: KMOTServes: Minot
- Miramar Marine Corps Air Station - Mitscher FieldIdent: KNKXServes: San Diego
- Mission FieldIdent: KLVMServes: Livingston
- Missoula Montana AirportIdent: KMSOServes: Missoula
- Mobile Downtown AirportIdent: KBFMServes: Mobile
- Mobile Regional AirportIdent: KMOBServes: Mobile
- Mobridge Municipal AirportIdent: KMBGServes: Mobridge
- Modesto City Co-Harry Sham FieldIdent: KMODServes: Modesto
- Moffett Federal AirfieldIdent: KNUQServes: Mountain View
- Mojave Air & Space PortIdent: KMHVServes: Mojave
- Molokai AirportIdent: PHMKServes: Kaunakakai
- Monroe County AirportIdent: KBMGServes: Bloomington
- Monroe Regional AirportIdent: KMLUServes: Monroe
- Monterey Regional AirportIdent: KMRYServes: Monterey
- Montgomery Regional (Dannelly Field) AirportIdent: KMGMServes: Montgomery
- Monticello Municipal Ellis FieldIdent: KLLQServes: Monticello
- Montrose Regional AirportIdent: KMTJServes: Montrose