I flew back and forth from TLV to LAX this week on LY's Dreamliner. I have to say I was positively surprised by the Wifi
Still showing up as beta testing so apparently free for everyone on flights to and from the US.
I had decent connection for the first 2.5 hours out of LAX, then went to sleep but I don't believe there is anything around Greenland, then ongoing since over UK (when I woke up)
I did a speedtest, below. Not sure how they will price this once it goes live officially.