This whole terminal is international, no domestic. People are really only stuck in the main lobby (not going through security).
Maybe get a larger security gate instead of the small one. I don’t know, just saying.
This is weird… first idea, a stupid one:
Is the security activated for passengers (might be set to staff only). I admit it’s a pretty stupid question. 
Second idea (sort of):
You have one security exit in the room of the international entrance (the right most exit), but it’s impossible to reach from international zone (I know it makes sense if someone forgot their passport they can leave this area, but), maybe (a BIG maybe) this causes the game trouble, dunno. 
It’s odd, in my opinion the setup I see in the screenshot should work… have you checked the Flight Monitor to see if the passengers for the waiting international flights are “checked in”?
Would you mind making your saved game available here?
Wow thanks for all the quick responses everyone… seems like we have found something weird here…
Sepone, good idea, the security checkpoint is set to passengers & staff… even tried turning off staff.
I tried a medium security checkpoint (large wouldn’t fit) and that didn’t seem to fix the issue either.
I removed the security exit from the international entrance as Sepone suggested. Again, no luck.
According to my flight monitor none of the large stands are stuck in “boarding”.
I play Airport CEO through Steam. I found the local files for the game, but no saved files. Where would they be located?
Much appreciated everyone!
My tutorial 
:
Just for the basics!
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I took a look at your tutorial humoresque before posting! Appreciate you putting a tutorial together for the community. I couldn’t really tell what the difference between your fourth picture and my situation is.
I did some poking around and found where my saved game is stored. Let me know if the link below doesn’t work. The terminal in question is on the right side of the map… no judging it’s one of my first airports 
https://drive.google.com/file/d/1FM-ZV6oUuLLIKl6tNSNj7fRdEGOsQVjp/view?usp=sharing
Save location (it’s from german Windows 10, but should be quite similar to everyone elses):
C:\Users\username\AppData\Roaming\Apoapsis Studios\Airport CEO
[EDIT] Nevermind, you’ve been quicker… 
I am checking out your airport
I had to click the download link twice, but then it worked. Let’s see if your save works for me…
hmm a bit concerning…
How do you view the paths? Or in this case a passengers desired/predicted path?
Use to magnifiying glass tool next to the template one
I am testing on my own save. Edit: on a save without international zones it worked fine
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Issue has been found!
You have two separate secure zones without terminal zoning! If you connect the two secure zones all new passengers will be fine. People were entering at the wrong checkpoint in the other terminal building and had no way to cross
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I found another issue. Flight Monitor says your passengers haven’t checked in yet. The Check-in Desks are not connected to the Baggage Bay! When they’re connected passenger start to enter the international zone. Voila! 
[EDIT]: As a reminder, the “Flight Monitor” can be found in the bottom left of the screen, next to the Flight Planner. Locate the appropriate stands/flights to get more detailed information, it sometimes helps to isolate/locate a problem. 
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Thanks guys! Makes sense.
Is there a way to keep passengers assigned to a certain terminal? i.e passengers that are flying out of the large stands would only go through security in that terminal? I poked around with the terminal tool, but it didn’t seem to work as I expected.
Passengers only use the Security Checkpoints assigned to the Stand they are heading for. When you click on a Stand you can see the blue lines going to Security Checks assigned to this Stand.
As long as the red Security Zone of a Stand is not connected to the red Security Zone of other Security Checkpoints, passengers will not use it.
The passengers walking from one Terminal to the other are most likely coming from Public Transport of the other Terminal. If you drag the Terminal Zone over the Bus Stops, Taxi Stands, etc. they will be considered part of that Terminal and passengers should only arrive and depart from these Public Transports. You can see what is connected to a Terminal Zone when it turns green.
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Hi @eschwartz96, if you want I can fix the issues for you. But you would have to sacrifice achievements, but I can turn construction on and sandbox off so its back to normal
I can do the two terminals solution vs. conneted terminals. If you want me to do it then tell me which one
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I looks to me that the security is zoned as staff only.
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Security checkpoints are always staff only 
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