Getting on N66 with a boarding pass (9)
I believe the answer is:
convivial
'getting on' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
(Other definitions for convivial that I've seen before include "Sociable and lively" , "Getting on" , "Festive" , "full of cheer" , "Genial" .)