When I had a couple month assignment in Topeka, I started out on a one-way ORD-MCI, then had round trips MACI_ORD_MCI for the weekends at home. I finished up early (or the budget ran out, hard to say), so I still have one ORD-MCI segment.

I am going there this week on a RT ticket, so I will still have the segment left over, until (if there is a) next time.