I started this trace-route within 30 seconds after the seatbelt sign was switched off (the wifi isn't enabled while taking off), so I imagine only a few people would have had the time to connect to the wifi at this point.

But in general, the wifi on one of these flights is very useless. I was hacking on a node.js project and used it to look up some ES5 related stuff on StackOverflow. I tried to post it to gist.github.com while in the air but wasn't even able to load the page (though google and SO loaded fine)