 That's the most in a single day ever. Eight of the ten busiest days in TSA history have come this year. I'm Jack Spear, NPR News in Washington. Support for NPR comes from NPR stations. Other contributors include Carla Itzkovich, whose gift in memory of Moises Itzkovich, founder of the Moises Itzkovich Foundation, helps provide public radio news and information to communities around the world. This is NPR.