Here's an interesting change. I checked my res today sfo-gnd-sfo, and low and behold, my return got changed to mia-dfw-sfo. No gnd-mia flights that day, so I guess the computer figured a person in my extremely fit, athletic condition (cough, cough) could easily swim to Miami.. Didn't even move me to a different date. This is actually good news, as we're going to have to reschedule the trip, so maybe now I can get a refund instead of a credit.