I suppose you get this a lot, but I have a ship with a person that's gone inactive on it. The ship is an X-wing, and I can't even get on board because of the one passenger limit.
You need to have it in a docking bay (tractor it) or on a planet (NPC it, maybe?) and then when you go to enter it, there should be an option to kick that person off so you can get in.
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"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
If the ship is in the atmosphere or in space and you are in a ship that has room for at least one more person(ex. a freighter) in the same square, make yourself Commander and Pilot, go to the entrance and there should be an option to board the ship outside and to kick the passenger. When you kick the passenger, he/she will go aboard the freighter. The point is, there has to be somewhere for the passenger to go safely if you are in space. This worked for me.
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Xeon's Speeder Race Novice League Winner Year 7 Day 334.