Air travel fatigue (3,3)

I think it could be either:

Which length description are you looking for?:

3,3

jet lag

'air travel fatigue' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for jet lag that I've seen before include "Delayed tiredness after long flight by air" , "Tiredness and disorientation after long plane journey" , "Flyer's ailment" , "Bad effect of air travel" , "Tiredness felt after long plane flight" .)

I've seen this clue in The Times and The Sunday Times.

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