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Re:WiFi without internet on a Southwest flight by nerdbert on Friday September 29, 2023 @03:57PM (#37709366)
KLM and United for sure have free in-flight messaging (at least as of a few days ago, the last time I used them).

It's interesting what does and doesn't go through. e.g. Facebook notifications update, but not the content. I guess that's because they use the same channel as FB Messenger.

Re:WiFi without internet on a Southwest flight by xcrunner529 on Friday September 29, 2023 @11:12PM (#37712510)
At least for iOS iMessage uses the same push notification endpoint so really you get iMessage plus any push notifications.