Passenger plane (8)
I believe the answer is:
airliner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">passenger plane</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for airliner that I've seen before include "Passenger craft" , "Passenger aircraft" , "One going aloft" , "Passenger plane" , "Large plane" .)