Mine changed as well, but rather more drastically than some listed here. And I did not receive any notification.
I was booked from SFO to MCO via Austin arriving on a Sunday at 7:20pm, then returning the following Sunday arriving at 8:35pm.
I just happened to check my itinerary and discovered they were now routing me through
Boston! and made my outbound flight a
red-eye arriving at 12:30pm
MONDAY (a full
17 hours later than my original arrival time.
I called but she did not offer to refund me until she had exhausted all possible flight options. Finally she offered a JetBlue credit or a refund to my cc, which I took.
If I wanted to fly through Boston and lose one night and half day of my Disney vacation I would have booked it in the first place.
Oh, and I did get the notification finally, the day after I cancelled the flights
