Wi-fi allowed? Great! Want to check your emails? No problem. Want to write a Steem article? More power to you. Calls? Please, NO!!
Making calls and having the people around you just chatting on the phone is one quick way to go crazy. You're all trapped in a metal tube that's 30,000ft in the air (approximately 10,000 meters for our metric friends). Flying can be stressful enough without having to listen to someone just yacking away.
I hope this idea doesn't spread.
(Just my opinion)