 Were you among those flying over the long holiday period? Airports in the U.S. have never been busier. TSA says its agents screened 3 million airline passengers yesterday for the first time ever as the July 4th holiday came to a close. It eclipses the record set on June 23rd. In fact, eight of the 10 busiest days in TSA history have come this year as pent-up travel demand tops pre-pandemic levels.