For flying passengers who wish to take a nap? (3-3)

'a nap?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'for flying passengers who wish to take' is the wordplay.
I cannot really understand how this works, but
'flying' could be 'air' (similar in meaning) and 'air' is located in the answer.
'take' could be 'be' (being is a kind of taking) and 'be' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?