Where does the data on the number of Americans traveling for Thanksgiving come from?

It was widely reported this year that nearly 49 million Americans would be traveling for Thanksgiving this year. This data comes from AAA and here is the methodology according to their press release from November 15:

AAA’s projections are based on economic forecasting and research by IHS Markit. The London-based business information provider teamed with AAA in 2009 to jointly analyze travel trends during major holidays. AAA has been reporting on holiday travel trends for more than two decades. The complete AAA/IHS 2016 Thanksgiving holiday travel forecast can be found here.

When numbers like this are used in public and reported on by the media, I would guess many Americans expect these figures to be based on surveys. So what is this projection based on? Surveys (probably via phone calls)? Historical models (based on factors like gas prices and broader economic indicators)? Certain retail and tourism figures like hotel and airfare bookings?

What makes this more complicated is that AAA is an organization that could benefit from increased travel, particularly driving. And as they note on the press release, their organization can provide benefits to travelers:

AAA will rescue thousands of motorists this Thanksgiving AAA expects to rescue more than 370,000 motorists this Thanksgiving, with the primary reasons being dead batteries, flat tires and lockouts. AAA recommends that motorists check the condition of their battery and tires and pack emergency kits in their vehicles before heading out on a holiday getaway. Drivers should have their vehicles inspected by a trusted repair shop, such as one of the nearly 7,000 AAA Approved Auto Repair facilities across North America. Members can download the AAA Mobile app, visit AAA.com or call 1-800-AAA-HELP to request roadside assistance.

This does not necessarily mean that the data is inaccurate. At the same time, it would help to make the methodology of their projections available.

Another thought: are Americans helped or hindered by these broad projections of holiday travel? If you are traveling, does news like this change your plans (i.e., leave earlier)? If AAA projects more drivers, do traffic delays increase (such as on the 405 in Los Angeles)? If the BBC links the incidents, perhaps people take these figures seriously…

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