You can now get free wi-fi at Sea-Tac Airport, courtesy of Google, which announced Tuesday that it is now sponsoring free wireless access at 47 airports around the US.

Sea-Tac’s free offer (along with Burbank Airport), are considered “indefinite,” while the others are scheduled to expire Jan. 15, 2010.

According to the Google Free Wi-Fi website:

When you’re traveling this holiday season, you can enjoy free WiFi at 47 participating airports and on every Virgin America flight. Just bring a WiFi-enabled laptop or mobile device and stay connected to family and friends for free while you travel now through January 15, 2010.

The promotion, in cooperation with three wireless carriers, is clearly a marketing effort to use free Wi-Fi to boost the Google brand.

Just be careful when logging on though – many hackers have set up “Free Wi-Fi” networks in public places, so make sure you’re actually hopping on board the Google one.

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