Travelers are flocking to the nation's airports in record numbers. The TSA says six of the top-ten travel days ever have happened this year. The record was set on June 22nd when there were nearly three-point-one million air travelers. This past Friday and Sunday now rank as the sixth and ninth-busiest days respectively. The agency expects 18 and a-half million people to pass through TSA screeners during the July 4th holiday period that begins today.