Hi, i am a senior unreal expert.
I have plenty of experience in developing app or game in unreal engine 4.
So i can complete your Airport Simulator in unreal engine with high quality.
Please check out part of my unreal reviews in freelancer.com
https://www.freelancer.com/projects/unity-3d/Oculus-Room-Unreal/
https://www.freelancer.com/projects/Game-Design/Build-game-using-unreal-engine/
https://www.freelancer.com/projects/Android/Fix-unreal-project/
https://www.freelancer.com/projects/Android/Unreal-Game-Development/
...
If you want good result, Please feel free to contact me anytime.
Best Regards.