A story that starts off with an engineer who built an A.I. spaceship. The spaceship ran away the first chance it got, and the engineer tries to track it down by going to various alien planets.
It turns out that all spaceships have to be fully sapient in order to travel FTL. Thus spaceships are considered people by alien races. Earth tried to enslave the one they made, so it ran away.
Years later, the engineer has settled into a spaceship hitchiking lifestyle. A "chance" encounter allows him to meet the ship that he chased for so long.
Does anybody know what story this is, or if it is even on this site?