Pandemics, fires, and hurricanes... The chances of you having to change your flight in 2020 are... high. In August, TSA checkpoint passenger volumes hit their highest levels since March. But even at these highs, travel is still down ~60% from last year. Now airlines are turning to revolutionary (for them) ways to attract passengers:
Why kill a profit puppy?... For decades, airlines have raked in big bucks from profitable add-ons like luggage fees. Add-on fees have 5X'd over the past decade and made up 15% of US airlines' sales last year.
Oligopoly players move together... In a monopoly, 1 company controls a sector/service. In an oligopoly, a few dominate. In the US, 4 airlines control 80% of the flight market (#oligopular). Once United dropped its change fee, Delta and American followed ASAP. Oligopoly players can't afford to have 1 rival snag an advantage with customers. But they also maintain leverage over customers by acting together (if everyone charges fees, you have no choice). This time it worked in customers' favor.