Though San Francisco International Airport says that it’s “a city unto itself,” such a claim is far from hyperbole. With a police force, fire department, sanitation workers and even a transit system, the airport is a smaller version of its namesake. And while its passengers don’t count as permanent residents, they still need to be looked after from the moment they walk through the door. Coordinating it all is a big job, and SFO has a new command post tasked with making it easier. Opened Jan.