The Sunday after Thanskgiving is the busiest travel day of the year. The Little Rock National Airport expects to see more than 7,500 people traveling through on Sunday. That`s the first time since before September 11, 2001. Lines at the airport were longer than usual for passengers to check in and go through security. Most flights to Chicago were delayed because of thunderstorms Sunday morning. Flights for the rest of the day were pushed back 20 or 30 minutes. Sgt. Jim Howington of the Arkansas State Police says there were no major problems on state highways. He says traffic was heavier than normal, but flowing smoothly. He said that`s partly due to the fact that most highways are free from construction and lane closures.