 Ping Huang, NPR News. Yesterday was forecast to be the busiest travel day ever at the nation's airports, and given the number of passenger screenings by the Transportation Security Administration, that was not just hype. TSA says they screen more than 3 million passengers. 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.