ok, I'll play more and see ... still, that that the passengers ships do nothing while there is pop to move around is suspicious, don't you think so?
Are they all just the passenger ships or the freighters too? Honestly, I never pay much attention to private sector ships becuase they are outside player control. It might be that the passenger ships aren't moving because you don't have someplace to move them to yet, like a recreation base. Eventually, they'll start moving when you find an AI recreation base (regardless of whether you have one of your own). Freighters pretty much move all the time though, moving resources around and such. Also you'll see this ships appear in your constuction yard, the private sector will build these occasionally as it sees fit (again, outside the player's control).
I don't really know what the priorities are for the private sector to move passenger ships. I do know that they move to recreation centers. I think they rarely but sometimes move to other planets perhaps to move population around (maybe from planets that are less happy to more happy, or to planets with a better development % or less tax/development).
Maybe somebody who knows how the private sector works better than I do can enlighten us as to what factors occur before the private sector moves passenger ships: recreation, population limit, happiness, tax, development level, etc..?
Not tho' the soldier knew
Someone had blunder'd:
Theirs not to make reply,
Theirs not to reason why,
Theirs but to do and die: