The global middle class has grown and the volume of airline traffic passengers has exploded since the mid 1980s. Looks like the annual number of airline passen

The global middle class has grown and the volume of airline traffic passengers has exploded since the mid 1980s. Looks like the annual number of airline passengers roughly doubled between 2006 and 2019: https://www.statista.com/statistics/564717/airline-industry-passenger-traffic-globally/ https://www.statista.com/statistics/564717/airline-industry-...