Airplane mode hasn't been necessary for nearly 20 years, but the myth persists.
You Don’t Need to Use Airplane Mode on Airplanes | Airplane mode hasn't been necessary for nearly 20 years, but the myth persists.::Airplane mode hasn't been necessary for nearly 20 years, but the myth persists.
The mentions the reason why; it's to reduce incidents of "air rage". Air travel is stressful enough without having people yapping loudly into their phones.