Does American charge a fee if I don't show up to the return leg of my flight? I have a round trip ticket that I want to change the return leg (same day just a later time). I understand a change fee is a hefty $200. On the website it's showing I can buy a one-way for $50 which obviously is better than paying $200. What happens if I purchase the one way and just don't show up to my original return leg? Pretty sure they will charge me the difference, or some sort of fee, right?