Not trying to belittle a serious problem, but I wouldn't worry about this particular concern....This is a biggie, Apple!! What would the FAA say?
... I am only going to know next time I fly and my plane falls out of the sky... or not.
It is worth noting that the prohibition against cell phone use while in the air is from the FCC, not the FAA. They're not concerned (any more) about the phone interfering with the plane. That's one of the reasons why most airlines allow Wi-Fi in the air and even provide Wi-Fi Internet access (for a fee, of course).
The FCC is concerned with overloading the mobile phone network. The idea is that your phone pings off of all nearby towers in order to determine which provides the best signal, in order to perform handoff operations as you move from cell to cell. When you're at cruising altitude, your pings may reach hundreds of towers at once - far more than would ever be reached from the ground. And you're moving fast enough that handoffs may occur several times per minute.
The protocols can handle this (which is why, for instance, passengers on the doomed 9/11 planes were able to make calls), but it puts a strain on the system. If everybody flying had their phones turned on, it would probably be enough of a strain that carriers would need to invest in large (and expensive) upgrades in order to maintain reliable service. Hence the FCC rule.
At least that's how I understand it.