 This as tens of millions take to the skies and roads ahead of the July 4th holiday. CBS's Chris Van Cleave. American, Delta, and United all expect to fly a record number of passengers, more than 18 million over the next 11 days, with Sunday, July 7th, likely to be their busiest. The TSA is poised to screen more than 3 million people for the first time ever, and that could happen any day now. It'll be the busiest summer ever. TSA Administrator David Pekoske told us his agency was ready for the crowds.