I was looking this weekend at my itins and saw my seat had be changed on an ORD-LAX segment in October, 319 equipment, from 1A to 3D. The segment was NOT marked as a "Schedule Change" nor did any elements of the flight change (flight number, times or equipment).

On another topic that I have not seen discussed here yet...

One thing I have just recently noticed is that My Itineraries is no longer flagging segments as "Schedule Change" when the only change is to the equipment type. I have seen this twice in the last two weeks where one flight (BOS-ORD in September) went from a 320 to 752 and another flight (DEN-MCI in October) went from a 319 to 735. The flight numbers and times were unchanged. 6C on the 320 became 10C on the 752.

Stay on top of those itineraries!