Anyone else have trouble booking online today (Thursday 12/18)? I would push a flight and it would come up differently with a big fare difference. I also, on a different reservation, swear that I booked a return flight through a different hub city (DTW vs MSP), but didn't think much about it since I got home at a similar time. With that said, the online help staff did assist me in my bookings, but I hope I don't lose my FF acrual otpions.