Gogo uses a dynamic pricing structure based on flight length and type of device.
If you prepurchase a gogo session on Delta.com it is $14.00, but if you wait until the flight and purchase then the rate can escalate to $21.95 for a flight from ATL-LAX.
I don’t always prepurchase because I don’t always know if I’ll need it that week and I try to keep my expenses in the week I use them.
Delta (and probably other airlines as well buy I haven’t tested on them) have a loophole. You can use the Delta website on Gogo without paying so if Gogo wants more than $14.00 for a flight pass, go to Delta.com and purchase a day pass (ie both segments of a 2 segment trip).
I go to Delta.com and in the upper right I search for Gogo.
Then I choose a 24 hour pass.
Make sure you enter the email address you use for gogo and when you login to Gogo it will see that you have a pass. Use the pass and you will be online for 24 hours for $14.00 instead of $21.95 for just the flight!