| English thesaurus | |||
| |||
| RTE (ssn) | |||
|
Round Trip : 33 phrases in 12 subjects |
| Airports and air traffic control | 3 |
| American usage, not spelling | 1 |
| Astronautics | 2 |
| Aviation | 11 |
| Communications | 1 |
| Economics | 5 |
| General | 2 |
| Information technology | 2 |
| Military | 1 |
| Oil and gas | 3 |
| Space | 1 |
| Technology | 1 |