Perhaps he's:
A mechanic on the wrong end of a bad prank by his fellow mechanics?
Good Humor man ?
Milk man?
Stowaway?
Saboteur?

Just think about what a little turbulence would do to that whole scene.

I also think that sweet talker dude in the mid pax compartment should go hang with the lone lady and her bong in the deluxe compartment.

__________________
1980 300D - Veggie Burner !