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I just flew that route in first class and the wifi barely worked.
It is free for first class and $18 for everyone else.
It worked for 1-2 hours after take-off but didn’t work over the North Pole, which was most of the flight.
It was pretty slow when it was working and also only worked on the phone and I couldn’t get it to connect on the computer.
I forgot who the provider of the wifi was but it wasn’t very good so I wouldn’t count on it working.