Frederic Lardinois for SiliconFilter:

From December 21st thru December 27th, Skype (and, by extension, Microsoft), will offer free access to third-party WiFi hotspots through its Skype WiFi program in over 50 airports all across the U.S.

You sign in using your Skype ID. Obviously if your local airport offers free Wi-Fi already, you don’t need this – but well-traveled airports like Boston’s Logan Airport, SFO, Chicago’s O’Hare and Midway, and dozens of others are on the list. Visit the Skype blog for an interactive map.