[speakfreely]

If you think about the complexity of routing bags from a single plane on to potentially dozens of connecting flights and onto the non-connecting carousel, it's actually amazing that the process is not screwed up more frequently.

[BobaFloutist]

I mean the bags have barcodes with their destination on them.

[speakfreely]

Of course, but no one is taking the bag physically so its destination. They're putting them on moving pathways that are matched to ever-changing information about gates, flight numbers, etc.

Flights arrive early or late or never at all, gates change frequently due to airport congestion. And the workers who are managing this are not known for their precision, so it has to be a super fault tolerant system.