** FILE ** Airline passengers check-in at George Bush Intercontinental Airport Tuesday, Nov. 20, 2012, in Houston. Americans can expect airports to be busier and planes to be fuller than ever, according to a forecast by the main trade association for U.S. airlines released ahead of the holiday. (AP Photo/David J. Phillip

** FILE ** Airline passengers check-in at George Bush Intercontinental Airport Tuesday, Nov. 20, 2012, in Houston. Americans can expect airports to be busier and planes to be fuller than ever, according to a forecast by the main trade association for U.S. airlines released ahead of the holiday. (AP Photo/David J. Phillip