Right now there really isn't any transport bigger than the Armored Transport that's made purely for moving passengers. You've got the Luxury Liner and, to a lesser extent, Geisha that are basically vacation destinations in their own right, the Yacht which is generally more for personal use, the Pilgrim which is just a horrible idea, and the Prison Liner and Royal Liner which are very obvious in their primary purpose.
We need more passenger transports, and a wider variety of them.
(actually I think we just need more transports and freighters, but I really like transports and freighters.)