According to Captain Chesley “Sulley” Sullenberger, the FAA has classified San Francisco International as a “special airport: “It is surrounded by water, and of course water is a featureless terrain where depth perception can be difficult. There is shifting winds, low visibilities—so there is many things that make it special. Plus there is high terrain, just past it.
http://www.cbsnews.com/8301-201_162-57592529/plane-crash-at-san-francisco-airport/
Special, yes. Like Vail, or to a lesser degree Grand Junction, and many others (even Midway) they present their own challenges. If you closed down all the airports with a special “hazards” you’d be left with Mid-continent and even then you’d be contending with the occasional dust-devil.
Besides, being classified as a special airport by the FAA isn’t that big of deal. For many reasons, I’m not going to get into that with you here, though.