I found myself playing around on the United app by clicking "where is this aircraft coming from?" Over and over to get an idea of where my aircraft had been in the last few days. It's amazing how little time they spend on the ground and I started to wonder whose job it is to plan the routes that an aircraft will fly in order to make it as profitable as possible. I'm sure there is a science to it but it seemed almost haphazard - my plane was in Hawaii one day and doing shorter Midwestern hops the next. So which person/team is responsible for determining where the planes are flying on a daily basis?