On notice: Delta

For Christmas originally my flights looked like this:
San Jose->LAX, 10am-11:15am
LAX->Logan, 12:20pm-8:40pm

Well, tonight I logged in to Expedia and my flights looked like this:
San Jose->LAX, 10am-11:15am
LAX->Logan, 11am-7:32pm

I've had flights rescheduled after booking before, but I've never had them schedule me out of a flight without being notified & automatically booked on a comparable trip. I wonder if they would have notified me before my flights!