🧳 Airport Baggage Handling: Check-in, Scanners, Tilt-Tray Sorter and Tug Trains to the Aircraft Hold

A 3D hold-baggage line as a queueing network: bags arrive at random, ride belts, wait for scanners, are sorted into flight chutes and carried by tug trains before the hold closes. Tune scanners, sorter slot time and tugs to hit a mishandled-bags target, and check the simulated waiting time against the Pollaczek-Khinchine formula, Erlang C and Little's law.