Concourse Communications built a Wi-Fi network in part of Detroit's airport: The network will be free through the end of the holidays and after that will cost $6.95 for daily use. Concourse went through some restructuring a few months ago, and is finally getting caught up on its contracted airports. It's had Detroit under contracts for years, and the three New York/New Jersey airports (JFK, LaGuardia, and Newark) are about to get fully built out as well instead of the partial service now available.