Small airport simulation
A small airport can have one
or two runways and taxi ways to to connect them. Tipically you also
find a passenger terminal, and maybe, a freight terminal, a plane
parking area, and a car parking nearby.
Your simulation should animate planes taking off and landing on the
runway(s), and air traffic control activity (instructions given to
pilots, dialogs with them, etc.).
The picture below show an aerial view of Cluj-Napoca Inetrnationa
Airport (actually a small airport).

You do not have to use images, but you can sketch things instead (draw
them).