On Friday night my second flight (from BWI to ISP) was canceled due to fog. I ended up flying to BWI and staying the night with a friend and then riding Amtrak on Saturday morning to NYC. I wrote a letter to Southwest and sent it on Sunday. Today (two days later!) I got a personal letter back letting me know that they refunding my miles (I used miles to pay for the flight) and gave me a credit to use toward another flight! Wonderful!