No, I don't mean leaving in the middle of a flight - but... I bought a round trip ticket (City C to City A via City B) and used the first half a few weeks ago. I am scheduled to use the return portion of the ticket in a few weeks. It calls for me to leave City A and change planes in City B with a final destination of City C.
The problem is, I don't want to go to City C. I want to stay in City B for a week or so and then return to City A. But I don't want to pay the $100 change fee. Can I just get off the plane in City B and stay there? What happens when I try to get a flight from City B to City A? Should I get the return flight on another airline? Do they check up on these things? Can I just tell them I changed my mind and I'm not getting on the connecting flight?