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A lot, actually. The plane "flies itself", err..kindof. There is still a ton of chatter between the air traffic controllers and the people in the cockpit turning the dials and pressing the buttons.
"Flying itself" is more about setting a heading and then telling the plane to maintain that heading/altitude. That, and things can still go wrong. Bad weather, bad equipment, etc. Having a pilot on board isn't that expensive, and it will result in saved lives. A computer isn't good at landing a plane with no nosegear, or diverting into a nearby river. Humans are.