I want to touch on something. I believe it's been brought up before, but I'd love to see airline themed objects. Obviously we can color our benches and seats certain colors, but I'd like to see THEMED objects. They could have 'liveries' and be 'assigned' to an airline. Here's what I'm thinking.
Gates- Assign airlines to a gate or set of gates.
Check-In and Gate AgentDesks- This is where the liveries would come in, and would produce the livery colored light, if you will.
Carpets- Ploppable objects on the floor for each airline.
Signs- They'd be on the walls or freestanding, but would produce the light.
Self check-in kiosks- Of course, in colors of the airlines.