Originally Posted by @ORD
Of course not. I was not asking about miles, just the possibility of using the only FRA->ORD segment. A drive from Geneva to Frankfurt via southern Germany would be a nice this time of the year.
Thanks
@ORD
As others have said, this is not possible unless you change the ticket and pay fees, and possible more for the flight that does not include the segment.
I've seen several fares that have been cheaper MKE->ORD->X instead of ORD->X. As others have said, the airlines doesn't want you to book the cheaper flight and skip the first segment. One thing I've learned that you can do is skip a final segment. As long as you don't check in bags for a final segment, you can skip the last leg. If one did this often enough, though, the airline might notice it and not be happy. Just some information for future trips, if such a scenario arises.