A bird goes by air; so do these (5,5)

I believe the answer is:

crane flies

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

'air so do these' is the definition.
I know nothing about this answer so I can't judge whether this works.

'a bird goes by' is the wordplay.
'a bird' becomes 'crane' (crane is a kind of bird).
'goes by' becomes 'flies' (flying is a kind of going by).
'crane'+'flies'='CRANE-FLIES'

Can you help me to learn more?

(Another definition for crane flies that I've seen is " insects appear".)

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.