| Answer | Crossword Clue |
|---|---|
| airlines | AIRLINE, an air transportation system |
| airline | an air transportation system |
| airline | an air transportation system including its equipment, routes, operating personnel, and management |
| flights | An act of flying; a journey made through the air or in space, esp. a scheduled journey made by an airline |
| airlines | An organization providing a regular public service of air transportation on one or more routes |
| plenums | An enclosed chamber where a treated substance collects for distribution, as heated or conditioned air through a ventilation system |
