Or is it really always all CGI?
But regardless, if "not scaring fly-scared people" was actually a concern, any planes crashing in movies would be forbidden, not just real planes crashing in movies. But it's not.
https://en.wikipedia.org/wiki/2012_Boeing_727_crash_experime...
So I guess they can crash planes.
And I hope the public makes the difference between a Christopher Nolan movie and what can happen to them on their way to Hawaii.