| A/N | Army / Navy |
| ADC | Airport Directory Company - commercial published directory of airports in USA |
| CAA | Civil Aeronautics Commission (part of the Department of Commerce) |
| DOC | Department of Commerce |
| E | East |
| ESE | East South East |
| ID | Identification |
| LF | Landing Field |
| N | North |
| N/S | North / South |
| NE | North East |
| NNE | North North East |
| NNW | North North West |
| NW | North West |
| RAC | Regional Aeronautical Chart |
| RR | Rail Road |
| S | South |
| SAC | Sectional Aeronautical Chart |
| SE | South East |
| SSE | South South East |
| SSW | South South West |
| SW | South West |
| TBD | To-Be-Determined |
| U.S. | United States |
| W | West |
| WAC | World Aeronautical Chart |
| WSW | West South West |