Im not sure where to put it, as this is a tip AND an idea.
There is already a thread about blueprint / ghost building (like factorio). I dont think it need to be so complex as factorio, but a handy tool for planning your layout. This is especially important when building baggage belts and system.
First, you cant flip the scanners og baggage bays, so you need to plan very specific to get it to work and especially in tight areas. Of course, you can pause and build and remove. But in some cases I want to plan before I have unlocked all the scanners. Also, integrating it into a running system is a challenge (and a bit what makes this game very nice). Its also nice to do some planning while time is running to bring in cash.
I have found that using floor tiles with different colors can be used as a kind of blueprint to build upon later.
Outside I have also used fences or sidewalk to make a border to work with, but floors inside are instant 
2 belt in and 2 generic scanners. On the bottom, the “red” baggage goes to the other scanner before put out to the specific scanner. This is the only way I found to have 2 scanners operating. From the spesific scanner, it goes in a loop and via a manual scanner before destroyed.
The loop back is a bit tricky, and based on my plan, I see I have to move the feeding line one square closer to the baggage Bay to make room for a return line.
I love complex things :)
Had to tweak it, but seems I can fit it. I will post the final result when done
? I use it all the time everywhere to make a clear separation of areas and stuff while building, so it would be sad to see it disappear. 
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. Both incoming and outgoing…