To be fair, I have watched a documentary about Sichuan Flight 8633 before I have watched this movie.
This is why I'm not overly enthusiastic about this movie. It was overall okay, but too draggy and I can't oversee the scenes that look as if they were put into the movie in order to let the entire crew and staff shine. Maybe there is such "drill" on Chinese airports but still it leaves me with doubt as I'm also aware of Chinese propaganda and they wouldn't allow their people to appear less than perfect in a movie of this sort.

What truly irks me is the fact that they overdramatized things. Really unnecessary in my opinion, because let's be honest, a broken window in an airplane is dramatic enough.
The facts: The co-pilot really got sucked out of the window which first cracked, before it broke completely. The co-pilot was halfway outside the window, his legs got stuck under the control stick, pushing it forward which sent the airplane downwards. The captain couldn't draw him back in, he also had to stop the airplane from its "fall" and get out of the mountains quickly in order to get to a height that allows breathing without oxygen masks.
The co-pilot was too badly hurt to help with anything, it was the third pilot who took over for him.

In real life there was no storm though, turbulences yes, but nothing major and no storm they had to fly through in order to leave the mountain area. Also how on earth did people on ground knew in the movie, that Sichuan Flight 8633 was in trouble, like one minute after the incident happened? That's nonsense.

The movie overdid it with the drama which makes the captain and others look like some sort of superhuman. He's a hero (I will not deny that), but that was too much for me. I prefer the documentary over this or the movie "Sully" that is also based on the real life event of an airplane landing on the Hudson River but not overdramatic.