Among our domestic airlines in the states I would rate Delta far ahead of United and American Airlines. They are excellent at sticking to their schedules and they actually seem to care about customer satisfaction. I have flown Delta from numerous hubs, and twice to SXM from ATL. Flights were on-time coming and going with no unexpected surprises. The other airlines I would consider would be Jet Blue and West Jet out of Canada. Those three would be at the top of my present list.