It turned out that this actually is a Delta rule, made for the comfort of other passengers, which anyone that has been sitting next to a chatterbox on a plane can wholeheartedly agree with. Another flight attendant that came to remedy the situation, said that it was actually a rule of the GoGo in-flight Wi-Fi service, and handed Mr Marco an FAA brochure.
He tried to take a picture of it, at which point the attendant decided to transform her mere opinion about the CEO as a difficult passenger into action, and called on the La Guardia airport cops to wait on the tarmac. What happened next?
So, remember, no VoIP apps on Delta flights, and no Words with Friends on AA. United seems to be up for anything, as no celeb or CEO has been reported for geeky wrongdoing during flight there.