Interesting.
Here is what GoGo says about their process:
"To get the Internet from your plane, the signal travels from your device to our cabin wireless access points, to our airborne server, through the satellite controller equipment to the antenna, then to the satellite and down to one of several ground stations around the world, and finally on to our data center. This is then done in reverse for data traveling to the plane."
Maybe some background app that normally is not active is now.