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| English thesaurus | |||
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| RTE (ssn) | |||
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Round Trip : 41 phrases in 15 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 |
| Law | 2 |
| Military | 1 |
| Oil and gas | 3 |
| Robotics | 2 |
| Space | 1 |
| Technology | 1 |
| Travel | 4 |