In 2011,
Wired wrote a piece on the terminal velocity of an iPhone falling from a plane, which is a good explainer how the device was able to survive. In a nutshell, the low weight and maximum speed of the iPhone leads to a limited amount of force on landing despite the height of the fall, so the end result isn't too much different from dropping it from a lower height.
What's kind of funny/interesting is that a major contributing factor to the phone surviving the fall was specifically
because the plane was up at 16,000 feet, which gave the phone plenty of time to slow down to terminal velocity of somewhere in the general ballpark of 50 mph.
If the phone had gotten sucked out of the plane just above the ground, in contrast, it would have been going hundreds of miles an hour, and almost certainly would have been obliterated by whatever it hit.
As I posted in the
iPhone forum, I'm skeptical but what a marketing opportunity for both Apple and the case manufacturer!
Edit: what is also amazing is that nobody was seated next to that door/plug. I would assume that was an exit row-ish type of seat and those are usually taken. In the past I have been lax with the seat belt.... no longer!
People fake stupid things all the time, but there's no reason to be skeptical--at terminal velocity, which something falling out of this plane would have been, it's not even particularly surprising for it to survive in good condition if it landed on soft organic matter (which it did), even more so if it got slowed down a bit by hitting some light foliage near the ground first.
Here's a guy dropping an older model from a weather balloon around that height and it survived just fine because it landed on soft dirt/sand. There are dozens of similar videos of GoPros on balloons.
It was incredible luck that on a ⅔ full plane no one was sitting there, but because it wasn't an exit row on this model, that row was no different than any of the others in terms of seat pitch, so there's no reason folks would have picked it for extra legroom.