I am a layman in management. What can I learn from the airline dispatch department? Is it easy to change jobs in the future? What about the possibility of promotion?

Aircraft load balancing, flight planning, coordination of crew and other departments, in short, scheduling belongs to navigation and operation monitoring, and the salary will be ok in the future. If you really work, you won't want to change jobs, because the salary after changing jobs is definitely not as good as your dispatch. However, the company will recruit some positions internally every year, and you can jump ship through the selection exam without worrying about promotion. This dispatch is still somewhat technical.