Since booking our September trip in April, Delta has now changed our flight times (and some flight numbers) three times now! I have been checking our itinerary every couple of weeks, and last night....new times again! Every time this happens, I have to call them to get our seats re-assigned. I asked last night if this was the norm, and was told "yes, and we do not notify you of changes until it is closer to your date of travel." We now have gone from 1 1/4 hour layover in ATL to 2 1/2 !! We should have driven to Buffalo and booked a direct SWA flight instead.