saved and exited in the middle of the quest with the guy on ship, when loaded in next day hes considered part of the crew, can click on him and order him around somewhat,

when i got to the destenation nothing happened, so i blew the ship up.

edit: the quest disapeared from the tab, but the waypoint to it is still there

might be worth noting i switched ships before saving and loading
took the guy with one, delivered(tried to atleast) with another

edit2: by the looks of it taking on another delivery quest fixes the marker, so thats nice