When the longest government shutdown in United States history ground most of Washington DC to a halt, it also significantly complicated global air travel. At many major airports, Transportation Security Administration (TSA) officers were required to work without pay. Unsurprisingly, call-outs spiked, tempers flared, and security lines across the United States stretched for hours, and the TSA struggled to keep up with record passenger volumes. Nonetheless, there are a few major airports that were almost untouched by this chaos. At San Francisco International Airport (SFO), for example, checkpoint waits were largely normal, even as nearby hubs wrestled with severe disruptions.