Well I use the term aircraft mode as I am British but yes that is what I always do - last thing I want is a moaning member of my staff ringing me mid flight to ask why her chair had been moved! Yes it DID happen!
Must be some nice places to fly in the Brecon Beacons! I'm in north wales myself.
I use an iPad and don't use airplane mode but then again no-one rings me in my iPad!
I fly I airplane mode after maps cash. Less distractions and it saves on battery draw.If I'm flying with my iPhone 6s should it be in airplane mode.
Beyond the interest in wanting to not be bothered by a call, there is no intelligent reason to use airplane mode. those that talk about frequency interference simply don't understand.