Great advice. They completely changed my return flights to earlier in the day for my flights last week but did notify me. I didn't like the change but figured I'd lose the seats I wanted if I changed to later flights. The flights I was originally scheduled to be on were completely shifted to the new, earlier time slots :-( In the past they'd notify me even if the flight time changed by a minute... I'm serious. The one time they didn't send me a notice, I learned to check almost daily since as my departure time approaches. I just happened to check the itinerary. Had I not checked, I would have been arriving at the airport to check in as my flight was taking off!!! Yikes. That would not have been a pleasant surprise.