According to planemechanic on post #134, the WiFi system cuts out if the plane is below 10,000 feet and within China (minus HKG).
In-flight WiFi Troubleshooting for FAs
On the 747 there are two switches for this system located in the G2 galley, left side, by door 2LH. If both of these switches are NOT illuminated then the system should be operational. The FA's can toggle the system on and off using those switches, there really is no other troubleshooting that can be done in the air.
The switches are inside a compartment, not normally visible unless the compartment door is open.
Not a chance in heck. Whose the main audience for wifi... business travelers, where are they flying... C and F mostly... UA aims for it to be a source of ancillary revenue and I'd be very surprised to see it waived in C or F. Now, one thing that I think is interesting (and smart) is that UA is simply buying the bandwidth/connection to the satellite and providing their own portal. So perhaps for full fare C or F tickets or something along those lines they could offer free wifi as they can tap into SHARES and MP to see info about a user.
It's not on the PS flights so I wouldn't expect it to be for others.
Different system though, with a different contract with a different vendor. UA is one of the launch partners for this new system. I would be hesitant to draw any conclusions from what they were doing (or not) with GoGo.