A few months ago, I purchased three Delta round trip tickets at $300 a piece. One for myself and 2 for my children. Since then, their Grandma wanted to fly them out to her house for a bit, then fly them on to our final destination arriving on the originally scheduled date. I called Delta to see how much it would be to change the departing airport for my children's tickets. They quoted me $500 a piece!! I purchased Air Tran tickets at $100 a piece and thought I would only use the return portion of the round trip tickets. I later found out I needed to arrive at our destination a couple days early. I called Delta to see about changing MY flight to a different day-- $400! I ended up being able to purchase a flight using miles with another airline. Then I received a paper receipt from Delta about my three tickets and I notice it says something like failure to fly any leg will cancel the rest of the reservation! I had been counting on using the return flights! I called Delta again, and they were as rude as could be and told me it would be $200 a piece to change them to one way tickets!! (personally, I do not understand this practice-- I have already paid for the seats, and they are going to charge ME for the honor of reselling them and making more money?). What recourse do I have here? I will actually be at the destination airport on the day the original Delta tickets would have put us there. Can I check-in online before the flight then visit the Delta counter at the destination airport and tell them there was some kind of mistake, that I actually was on that flight and thereby save my return flights? I am desperate not to lose any more money on this Delta fiasco (btw, I will never fly them again due to their horrendous customer service). Thanks to anyone with any insight into how to get around this limitation.