Originally Posted by
JJeffrey
1) It makes sense that you can't just drop the BA segment off the end since that would in fact change the award type from a partner award to a flight award.
2) In theory yes, if LHR-BCN opens up then you should still be able to change the last segment to that. However many agents are poorly trained and either don't know how to do it or insist that changes cannot be made to any awards at all. So this may take a lot of HUCA to accomplish.
3) It won't be any problem if you throw away the LHR-OPO segment and just book a separate LHR-BCN. Obviously don't do this if you have any checked bags as they will be tagged to OPO. When you land at LHR pull up your reservation at aa.com and cancel it, this will remove you from the LHR-OPO flight. Then just go through flight connections like usual with your separate LHR-BCN boarding pass.
Following up on this. You can actually cancel the flight you are currently on mid-flight? I.e. if I am flying IAD-DOH-DEL, I can cancel the flight while I am on the IAD-DEL segment or upon landing so that I can take a different DOH-BOM flight?