It seems to be a crapshoot on transcons: Sometimes a full flight pass is $20, sometimes it is $39.

For example, today's SFO-EWR is $39, and the prior JFK-SFO flight (which as we know is the longer flight) was $20.

I think it's the case that the crappy terrestrial gogo is priced higher vs the satellite service, which is just backwards and makes it even more wild. Today's service was so bad I wrote into gogo, who were kind enough to offer a full credit without much hassle..