I love those classic sets! I owned everything related to aviation and at one point built a huge airport layout with two parallel runways and another two intersecting runways complete with taxiways, general aviation and a small terminal. Sad to say, it took up most of the floor in my room and my parents wouldn’t let me keep it together lol
This brought back a lot of good memories. I felt like I was watching a video of my own imagination from a time that I can't believe is so long ago now!
Why don't you try to make a real terminal that has gates with out any stairs, and there should be much more larger, and bigger runways. Any it was good :)