 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. Get renter's insurance to protect the things that make your place a home, including coverage for theft or damage. Visit Progressive.com.