That is quite interesting and would be worth a blog post of it's own. I have noticed that it's less of a hassle to sit down, open macbook type password and be either on the network or at least able to get to the login/TOS acceptance page than with any Windows or Linux laptop I've dealt with.

It would be interesting to see real data from a location with a random though not unbiased sample (air travelers probably skew richer and younger than the average population).