During escape that's provided during plane journey (2-6)
I believe the answer is:
in-flight
'provided during plane journey' is the definition.
(I've seen this before)
'during escape' is the wordplay.
'during' becomes 'in' (I've seen this in other clues).
'escape' becomes 'flight' ('flight' can be a synonym of 'escape').
'in'+'flight'='IN-FLIGHT'
'that's' is the link.
(Other definitions for in-flight that I've seen before include "Like airline service" , "Provided during plane journey" , "During air journey" , "taking up?" , "On the wing" .)