Thank you guys! Your words are inspiring me of keep on developing the airport. I think I will wait for the big birds to come out and see how it will affect the layout of the airport. I’m already preparing for the worst 
I have added more security checkpoint, in addition to the ground floor, they are also on the first and second floor.
I am also increasing the boarding gates to two (medium) per each stand, I think one is simply not enough although the staff always being late to their job positions is definitely the main reason of the delays.
@DoughBallDude and @wingmandude: I am sorry guys, the name doesn’t actually refer to the layout of Glasgow airport or Prestwich, I named like that because of my love for Scotland (and my wife is Scottish )
@Luctor: I saw that you did. Nice start on Albuquerque International Sunport!! I like it!
@twocflyer Thank you! Yes they do actually sit, just be sure to have an over plus of security staff.
@Stu: That’s actually a great idea! I wanted also to do an inspection room and re create the after security area where passengers usually gather their belonging before moving on. The first one, I just didn’t enough space to do it, unless I would make it even creepier and build it in the -1 level The second one I tried to do it, but I think the result is poor, I’ll just wait for more decoration items in the game to detailed it better.