They told me when the change is over 60 minutes from original departure time, they are required to accommodate you. In my case, I had booked a 5:25 AM departure flight, and they changed ours to 7:20 AM departure. As it turns out, they had a 6:00 AM flight that they put me back on and all worked out. They also changed our return flights but these were less than the magic 60 minutes and they would not adjust those to other flights without me paying some additional money, which was not going to happen.