would you have opened the door?? spoiler

Then he would have been dead, too and their child would have no parents. She realized that

Not only would I not have opened the door under any circumstances, I probably would have informed them I was turning off video feed and sound from the cabin. No good can come from watching them use the passengers as leverage and if they believed I wasn't seeing what they were doing, there's a slim chance they stop offing people.

In any case, opening that door is dooming everyone on the plane as well as hundreds on the ground. Only a fool would open that door.

No, only an idiot would have opened it.

What I would have forced myself to do is to turn off the camera and cut all communication with the cabin and just landed the plane ASAP and hope for the best.

Why was there no air marshall is my question?

Movies that rely on their characters acting stupid are bad movies.
They have training for pilots for circumstances like that.
When he turned back on the video and they grabbed his girlfriend/fiance I turned it off and rated it 3/10