M
- Macomb, Macomb Municipal Airport
- Macon
- Madison, Dane County Regional-Truax Field
- Malta
- Manchester
- Manhattan
- Manitowoc
- Manley Hot Springs
- Mansfield
- Marathon
- Marfa
- Marietta
- Marion
- Marshall / Ryan
- Martinsburg
- Marysville
- Marysville/Beale
- Mason City, Mason City Municipal Airport
- Massena Richards Field
- Mattoon / Charleston
- Maxwell
- Mayport
- McAlester
- McAllen
- McCall
- McCarthy
- McComb
- McCook
- McGrath
- Mc Gregor Automatic Weather Observing / Reporting System
- Mcguire Air Force Base
- McKinley Park
- McKinney
- Medford
- Medford Rogue Valley Intl Apt
- Medicine Lodge
- Meeker
- Mekoryuk
- Melbourne
- Memphis International Airport
- Menominee Automatic Weather Observing / Reporting System
- Merced
- Mercury, Desert Rock Airport
- Meridian
- Merril Field
- Merrill
- Mesa/ Falcon Field
- Mesa Williams Gateway
- Metropolitan Oakland International Airport
- Miami
- Miami
- Middleton Island
- Midland
- Midway Airport
- Miles City
- Milford
- Millinocket
- Millville
- Milton
- Milwaukee International Airport
- Minchumina
- Mineral Wells Airport
- Minneapolis-St. Paul Intl Apt
- Minot Air Force Base
- Minot International Airport
- Miramar
- Missoula
- Mitchell
- Moab, Canyonlands Field
- Mobile Downtown
- Mobile Regional Airport
- Mobridge
- Modesto
- Moline
- Molokai
- Monroe
- Monroe, Monroe Municipal Airport
- Montague
- Montauk
- Monterey
- Montgomery
- Montgomery Dannelly Field
- Monticello
- Monticello
- Monticello Municipal
- Montrose
- Moody AFB
- Moorhead Municipal Airport
- Morgantown
- Morristown Municipal
- Morrisville, Morrisville-Stowe State Airport
- Moses Lake
- Mountain Home
- Mountain Home
- Mountain View/Moffett Field
- Mount Airy, Mount Airy/Surry County Airport
- Mount Ida
- Mount Pleasant, Mount Pleasant Regional Airport
- Mount Pocono
- Mount Vernon
- Mount Washington
- Mt. Clemens Selfridge
- Mt Shasta
- Mullan Pass
- Muncie
- Muscle Shoals
- Muskegon
- Muskogee
- Myrtle Beach Intl Airport
