Crossword Genius

Historic air liner still possibly seen in the sky (5)

Ross

I believe the answer is:

comet

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

'the sky' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'historic air liner still possibly seen' is the wordplay.
I cannot really see how this works, but
'seen' could be 'met' ('meet' can be a synonym of 'see') and 'met' is found in the answer.
The remaining letters 'co' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?

(Other definitions for comet that I've seen before include "Long distance traveller" , "Celestial body - early jet aircraft" , "Rudolph's companion" , "potential space invader" , "body found in space" .)

I've seen this clue in the Evening Standard.
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