A newly formed coalition of US technology firms and advocacy groups called Thursday for the expansion of Wi-Fi, saying airwaves are getting congested for a key pathway to the Internet. The new coalition calling for expansion of unlicensed, or free spectrum for Wi-Fi includes Google, Microsoft, Comcast, the Consumer Electronics Association and other companies and organizations. In the United States, more Internet traffic is carried over Wi-Fi than any other path, the coalition said in a statement. Recent analyses indicate that Wi-Fi in our homes, businesses, schools and libraries is becoming congested by a deluge of data from more devices, applications and services connecting to the Internet without wires.