On a related note, if anybody can advise...
I have to travel MUC-JFK and return JFK-LHR later this year. I booked a return on BA, MUC-JFK-MUC with the intention of not flying the last sector LHR-MUC. (The fare BA were asking for MUC-JFK-LHR was nearly double...) I'll most likely travel with hand luggage only, so in theory there's nothing to stop me walking out of T5 on the return, but is it a good idea? Does anybody know if I'll have my miles or TPs deducted, or perhaps the previously mentioned "large saved object" will come back to bite me next time I book with BA?
It seems like a waste of time to complete the itinerary and book a one way MUC-LHR. But technically, I suppose I'll be breach of contract if I don't..?