Our airline was based at SNA in southern California and we had 737 100's and 200 and 300's flying out of there for over a decade with usually every seat full with no problem with 5700 ft of runway. With the higher powered Boeing 737's now Key West is easy. I am glad they are getting good service in there now. It is a fun place to visit but a bit of a drive from MIA. About 3 and a half hours with no traffic.