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You Don’t Need to Use Airplane Mode on Airplanes
(gizmodo.com)
This is a most excellent place for technology news and articles.
The article is crap, but it is correct in that you don't need to use airplane mode. I would, however, advise to still use it purely to preserve battery life of your device as otherwise it will very aggressively keep scanning for networks and drain it.
Yep. I do wish there was a toggle for the cellular radio by itself (rather than just mobile data). It's annoying to have to go airplane mode then turn WiFi and BT back on.