 ABC News, I'm Chuck Sievertson. Under severe thunderstorm watches now and through the evening, over 60 million Americans along the East Coast, North Carolina to Maine, amid record-breaking July 4th travel. ABC's Faith Abubay. The TSA expects this holiday travel period to peak next Sunday, July 7th, anticipating it will screen more than 3 million passengers in one single day across the nation, which will be the agency's busiest day ever. Over 1,100 flights have been canceled this evening in the U.S., according to FlightAware.