| 82 | Airport Location Offset Allowed (XP11) | Airport location offset allowed to avoid conflict with autogen. | |
| 4 | Always Flatten (XP11) | Always Flatten has been set for this submission | |
| 12 | Always Flatten Ineffective (XP 11) | Always Flatten has been set for this submission but failed to correct the mesh | |
| 81 | Closed Airport | An airport known to be closed, or reported as closed. | |
| 7 | Exclude Submissions | (No description) | Reserved |
| 19 | Iconic Airport | An iconic airport for flight simmers | |
| 15 | Major Airport | A major international airport | |
| 3 | NAVAID Incursion | A navigation aid incursion is present at this airport. Either the airport, or the navaid, are mis-located. | |
| 46 | Overlap - Legitimate | This airport legitimately overlaps another airport | |
| 83 | Runway offset from actual location | Runway cannot be placed in correct location due to bad CIFP data | |
| 54 | Scenery Tile Tearing (XP11) | Mesh scenery tiles are tearing at or near this location | |
| 32 | Scenic Airport | An airport located in a region that has outstanding scenic properties | |
| 10 | Terrain Incompatible (XP 11) | All of the terrain at this airport has the wrong texture - probably because the airport had no boundary at the time the mesh was cut | |
| 17 | Terrain Incompatible at Perimeter (XP 11) | Portions of the terrain at this airport have the wrong texture - probably because the airport has moved from the original boundary | |
| 45 | Terrain Injection | No longer used | |
| 60 | Terrain Mesh Impacts Water Ops | Terrain mesh incursion on a water body used for seaplane operations | |
| 41 | Terrain Mesh Missing or Compromised | Terrain mesh is missing in an area where it should be present, or it is present but not plausible | |
| 36 | Top 30 | One of the top 30 largest airports in the world | |
| 37 | Top 50 | One of the top 50 largest airports in the world | |
| 49 | Very Large Airport | A very large airport that requires an exception to be coded in WED in order to pass validation | |