International Airport · Northside · 355 tips and reviews
Mashable: Though Jacksonville, FL is the largest city by land area in the continental U.S., its airport is relatively small. It was also one of the first airports to provide free wi-fi, per the JAX website.
International Airport · Natomas · 382 tips and reviews
Mashable: If you're flying in or out of California's capitol city, you'll be happy to know you can pass the time by surfing the web via free public WiFi.