Crossword Genius

Two-way air traveller? (4)

Ross

I believe the answer is:

bird

I'm a little stuck... Click here to teach me more about this clue!

'air traveller?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'two-way' is the wordplay.
'two' becomes 'bi' (I can't justify this - if you can you should give a lot more credence to this answer).
'way' becomes 'rd' (short for road).
'bi'+'rd'='BIRD'

Can you help me to learn more?

(Other definitions for bird that I've seen before include "Charlie "___" Parker - time inside" , "Flying creature" , "Nest builder?" , "Egg-laying creature" , "Prison sentence - hawk, perhaps" .)

I've seen this clue in the Evening Standard.
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