I mentioned "giving Up' with reference to convincing individuals that have trouble imagining this idea
It's not that we have trouble imagining the idea, it's that it's IMPRACTICAL.
Driving around in FSDT airport hangers is not much different than walking around in airport terminals.
The difference is just one: It makes sense going around airport hangars because we are in a Flight Simulator, it doesn't make sense to walk around insides of airports because this isn't a airport passenger simulator.
In the past, I have entered some airport terminals with the "Walk & Follow" program I purchased years ago. I don't remember exactly what scenery it was but, I have entered airport terminals in FSX and saw views outside, from the inside. After experiencing these things and seeing how I can move about the passenger cabin in the Captain Sim B767 & B777 A/C's, it becomes easy for me to imagine and consider this feature about airport terminals.
It was probably the old Flytampa Dubai scenery, which was originally for FS9, and the "inside" of that was for Looks on the outside, because the terminal has a lot of glass on the outside.
Does it not sink in your head about FSX's finite 4GB of memory? Why would developers even THINK about the inside of the airport when the complexity of addons now are reaching higher and higher levels? More addons are being stuffed into every area every day? They have MUCH more things to focus on, adding new features, more stuff etc, to the airport on the OUTSIDE, where you will be spending 99% of your time.
If you really load up your Flight Sim to just go inside to the airport and watch AI, I really suggest a new game for you.