DTW was free for me in November, but now whacks you for 6.95. It's the same service that MSP has.
I love that the Alaska Boardroom has it FREE, wish I did more north-south than SEA to the godforsaken northern tier.
What I REALLY hate is that the S satellite of SEA has Boingo for $7, then if you fly to MSP or DTW, you have to pay an additional $7. All of this while sitting in Worldclubs. I've given up and just to freakin' dialup. Worldclubs should DEFINITELY get a program together.
Footnote: the Idaho Falls airport offers free WiFi throughout. Go figger, any of you who lives in a high tech mecca.