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.
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.