| Answer | Crossword Clue |
|---|---|
| PLY | Travel a route regularly |
| flyways | A route regularly used by large numbers of migrating birds |
| flyway | A route regularly used by large numbers of migrating birds |
| liniest | group of public conveyances plying regularly under one management over a route |
| airlines | A route that forms part of a system regularly used by aircraft |
| commutes | travel back and forth regularly (as between a suburb and a city) |
