I fly the 764s across the Atlantic regularly and the WiFi is fine 90% of the time. I have the monthly worldwide subscription so don’t know about individus pricing. Sometimes, I will be dropped after some period of inactivity but I just reconnect to the network and it’s fine (don’t have to re-sign in).

I have only had maybe one or two instances in the last nine months on the 764s across the pond when the whole WiFi just didn’t work at all after multiple reboots.