Google announced today that it will provide free wireless internet access at 47 U.S. airports and on all Virgin America flights for the holiday season. Starting now through January 15, anyone should be able to log on to free Google WiFi at BWI, which is the only local airport included in the program. You can find the complete list of participating airports here. Naturally, Google says it plans to use the free service as a means to advertise its products, like iGoogle and Google Chrome, to potential new customers. Still, paying that extra $9.99 for a day pass for internet access at most local airports is a huge drag, so until every airport starts offering it for free, all the time, we’ll take what we can get.