Crossword Genius

Overhead lines (7)

Ross

I believe the answer is:

airways

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'lines' is the definition.
(I know this)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for airways that I've seen before include "travel company" , "Inspiring passages" , "Ventilation passages" , "Radio channels" , "Things fly along here" .)

I've seen this clue in The Globe and Mail.
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