 The Transportation Security Administration, or TSA, screened 3 million airline passengers Sunday. It's the largest number ever in a single day for the agency. It works out to 35 passengers a second. Eight of the 10 busiest days ever for TSA have come this year. This is CBS News. Sponsored by Progressive Insurance. We offer auto, home, and commercial auto insurance, plus a variety of business insurance options. Visit Progressive.com today.