What is the effect of king comparing freedom movement to the flight of an airplane in paragraphs 10 and 11?

By comparing the freedom movement to the flight of an airplane in MLK's Nobel Prize Acceptance Speech, King recognizes all of the people who made the movement possible. When talking about the flight, he mentions all of the personnel, not just the pilot but all of the ground crew who are rarely seen, that make the flight successful. He is pointing out that the freedom movement couldn't have been successful without all of the people in the background.