| consist of a surface ar… | 0.68 |
| remain closed | 0.56 |
| open | 0.65 |
| safe | 0.41 |
| clear | 0.31 |
| classified | 0.31 |
| closed | 0.84 |
| controlled | 0.63 |
| designed to contain pro… | 0.62 |
| restricted | 0.47 |
| configured to contain a… | 0.41 |
| serviced by a radar app… | 0.36 |
| needed for landing | 0.25 |
| delegated by the faa | 0.25 |
| missile | 0.25 |
| artillery training | 0.25 |
| testing | 0.25 |