also, fun air traffic controller insider tidbit:
SW is really good at being on time. The reason is because their pilots are monitored and compensated on timeliness to a higher degree than other carrier pilots. It's a union job so I don't know how they can do that but they do. anyway, air traffic controllers are pretty positive that if there's ever a runway collision that explodes a couple big birds it's going to be because a SW jet comes in hot to meet their timeliness cutoff. I guess when a window opens up for a runway a SW pilot will just barrel into it pretty hilariously (as far as these things can be hilarious)