A Port Authority police officer with an explosive-sniffing dog looks over a drop-off area at LaGuardia Airport in New York, Wednesday, Nov. 25, 2015. An expanded version of America's annual Thanksgiving travel saga was under way Wednesday with gas prices low and terrorism fears high. An estimated 46.9 million Americans are expected to take a car, plane, bus or train at least 50 miles from home over the long holiday weekend, according to the motoring organization AAA. That would be an increase of more than 300,000 people over last year, and the most travelers since 2007.