It's more human than machine.
Let’s forget about the idea of getting the part to the aircraft, rather, think about the people and cargo the aircraft is carrying. Think about the soon to be grandparents flying to celebrate the birth of their first grandchild. Put yourself in the shoes of the parent returning home from a week-long work trip trying to get home to kiss their kid good night or make it home in time for a game, school play, or recital. A college student returning home for the holidays. A child’s first flight and trips to Disney. The pilots and crew that are trying to get home after being away for weeks. What about the cargo on the flight, maybe a transplant making its way to a patient? Or, parts required to return another aircraft to service?