I tend to disagree with Bastion above regarding all airlines. I have flown on almost all of them, and there is most definitely good ones and bad ones. United isn't my top choice, but I have flown with them several times to both San Francisco and Cancun with very few if any issues. They don't nearly cancel or change flight times as much as American does. When it comes to being on-time, here I have found them to be a bit below average. Delta, on the other hand, has been rock solid for us. Almost always on schedule, and when they have had time adjustments in the past it's always been reasonable and never more than say a half hour. Jet Blue is still my preferred choice to SXM, and if Southwest flew there I would probably have them in the mix as well. Jet Blue has more comfortable general seating, a bit more leg room, and by far better free snack choices on their shorter flights.