Mine would be Delta. I know the service has gone downhill, but I've pretty much flown with them all my life, and would never change (unless they went out of business or got really expensive). Getting out of ATL on time is a joke though, that's the only problem with DAL. Second would be (don't laugh) Northwest. The service is pretty good, and I love the breakfast on long flights. Flights usually get out on time, and I don't mind flying on the old planes.