Process
When baggage is checked in at the ticket counter or with a sky cap (where it receives a bag tag indicating the passenger's itinerary), it is often placed onto a moving bag belt which carries the baggage to the bag room. This is where numerous checked bags are sorted so that they will be loaded onto the proper flight. The bag tag which was previously affixed to the baggage during check-in is then read by a baggage handler and placed into the proper bag cart (usually a 4-wheeled trailer) or Unit Load Device (ULD; a machine-loadable container). The bag cart or ULD is then eventually pulled from the bag room by a bag tug and out to the aircraft for loading by baggage handlers.
In addition to "pushing" an aircraft from the terminal gate (with a "push back" or "tow motor") to position it for engine start and eventual taxi, baggage handlers also may tow aircraft to and from another gate or to a "remote" or RON ("remain over night") parking area . There will be a mechanic in the flight deck 'riding the brakes', who communicates with ATC ground control (for movement clearance), and operates of the APU ("auxiliary power unit"), brakes, lights, while the agent will operate the tow-tractor. In some union negotiated airlines or stations this job could also be done by the baggage handler.
Read more about this topic: Baggage Handler
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