Acronym |
Definition |
| 1C3 | Argyle Airport, Argyle, New York USA |
| 1C4 | Raintree SeaPlane Base, Elkton, Maryland USA |
| 1C5 | Clow International Airport, Bolingbrook, Illinois USA |
| 1C8 | Cottonwood Airport, Rockford, Illinois USA |
| 1C9 | Frazier Lake Airpark Airport, Hollister, California USA |
| 1D1 | Milbank Municipal Airport, Milbank, South Dakota USA |
| 1D2 | Canton-Plymouth Mettetal Airport, Canton, Michigan USA |
| 1D3 | Platte Municipal Airport, Platte, South Dakota USA |
| 1D4 | Mayfield Airport, Akron, Ohio USA |
| 1D5 | Luther Airport, Chittenango, New York USA |
| 1D6 | Hector Municipal Airport, Hector, Minnesota USA |
| 1D7 | Sigurd Anderson Airport, Webster, South Dakota USA |
| 1D8 | Redfield Municipal Airport, Redfield, South Dakota USA |
| 1D9 | Lennox-Skye Air Service Landing Field, Lennox, South Dakota USA (closed 2004) |
| 1E2 | Terlingua Ranch Airport, Alpine, Texas USA |
| 1E4 | Palo Duro Airport, Amarillo, Texas USA |
| 1E6 | Elkins Field Airport, Clarkton, North Carolina USA |
| 1E7 | Buffalo Airport, Amarillo, Texas USA |
| 1E8 | Moores Airport, Degrasse, New York USA |
| 1E9 | Maples Field Airport, Canyon, Texas USA |
| 1F0 | Ardmore Downtown Executive Airport, Ardmore, Okahoma USA |
| 1F1 | Lake Murray State Park Airport, Overbrook, Oklahoma USA |
| 1F2 | Plateau Sky Ranch Airport, Edinburg, New York USA |
| 1F3 | Hartlee Field Airport, Denton, Texas USA |
| 1F4 | Madill Municipal Airport, Madill, Oklahoma USA |
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