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Please post some shots of the depot and where it's placed so we can get a better idea of what's going wrong. If we can see it, we can usually tell almost right away.
Screenshots (procedure listed above) will help with the diagnosis tremendously. Silver Knight, SimAirport, SimCasino, Simple Ball: Extended Edition. It's strictly an airfield item used by aircraft. Milk outside a bag of milk outside a bag of milk, Millennium - A New Hope. They're not for pax to drop off luggage or pick it up. (They also need vehicles to work them, but that's a separate issue.) They cannot be placed outside of the fence or anywhere but alongside a taxiway to work. Upstream: Ticketing desk (s) blue -conveyer-> blue Hub purple -conveyer-> purple Baggage depot. It is quite confusing at first, since the whole logic of making baggage conveyers changed.
They must be installed adjacent to taxiways to work. I just got this game today, and I'm really struggling to understand how the baggage system works. Baggage depots are used to load on and unload bags from planes.
SIMAIRPORT BAGGAGE DEPOT WIKI OFFLINE
If you're using a starter airport, there is a fence around it, but if you buy land or demolish buildings or fences, you may have opened up that fence line and knocked your field offline because it's no longer secure.
There cannot be a path from the road to the runways/ramps/taxiways. Otherwise, it's not secure and won't work.
The entire airfield has to be surrounded by fencing. Okay, super basics and concatenating what's above.