I'd like to point out emirates allows voice cellular calls, over their on board cell network. I've neither been bothered by anyone, nor seen anything saying you could not do it over US airspace.

While I don't have any major love does the idea of people sitting next to me gabbing, the amount of vitriol in this thread is laughable (and I've made both Skype and FaceTime calls once or twice in urgent work situations in C over the pacific). I Kept it short and quiet, and no one scowled. VPNs have their benefits!