This just came out 3 days ago, it does not say who the carrier is or if it will be free. What is cool is that it's available in the entire airport regardless of where you're located. I'll check it when I'm out there in a few days and report back.
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Wi-Fi Arrives at Sacramento International Airport
Joins Handful of Airports Nationwide with Complete Wireless Internet Access in Terminals
The Aug. 15 launch of Wi-Fi Internet access at Sacramento International Airport can reduce that search to a single click for anyone with a properly equipped laptop computer. Short for wireless fidelity technology, Wi-Fi means travelers can hop online from any point in Terminal A or Terminal B while waiting to catch their flights.
A number of airports offer limited Wi-Fi access, but Sacramento International is among the first in the U.S. to extend access throughout its terminals. By installing Wi-Fi, Sacramento International joins a small but growing list of Wi-Fi enabled airports ...
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[This message has been edited by TravelManKen (edited 08-19-2003).]