You can expect longer waits and bigger crowds at U.S. airports next week. The Airlines for America's holiday travel forecast says 45-million passengers will fly between December 17th and January 4th, up two-percent from last year. That breaks down to 47-thousand travelers a day. The busiest travel day is Friday, December 19th, and the least busiest days are Christmas Eve, Christmas Day, New Year's Eve and New Year's Day.