Plane journey (6)
I believe the answer is:
flight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plane journey</span>' is the definition.<br/ ><span class="explanation-format__explanation">(flying in a plane)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for flight that I've seen before include "Fleeing" , "Trip by air" , "the vanquished may take?" , "Air transport - running away" , "Journey made by plane" .)