| Subject | English | Thesaurus |
| avia. | pilot-in-command under supervision | Co-pilot performing, under the supervision of the pilot in command, the duties and functions of a pilot-in-command, in accordance with a method of supervision acceptable to the Licensing Authority. |
| avia. | under command | An aeroplane on the surface of the water is 'under command' when it is able to execute manoeuvres as required by the International Regulations for Preventing Collisions at Sea for the purpose of avoiding other vessels. |