Before you can cut into that turkey, you'll have to deal with a flock of travelers that'll make you wish the pilgrims had turned around and sailed back to England. More than 40-million of us will drive over the Thanksgiving holiday; millions more will head to the airport. But we've some valuable tips on smoothing the ground-to-air transition; including packing tips to keep you from gobbling up so much room in your luggage and comparing the cost of flying versus driving.