With just four companies controlling nearly two-thirds of all domestic flights in the U.S. as of 2021, it has been purported that the airline industry is an oligopoly. These four companies are Delta Airlines, United Airlines Holdings, Southwest Airlines, and American Airlines. According to a report compiled by the White House, "reduced competition contributes to increasing fees like baggage and cancellation fees. These fees are often raised in lockstep, demonstrating a lack of meaningful competitive pressure, and are often hidden from consumers at the point of purchase." Interestingly, in 1978, The Airline Deregulation Act was imposed, which stripped away the Civil Aeronautics Board the ability to regulate the industry. Prior to this time, the airline industry operated much like a public utility, while fare prices had declined 20 years before the deregulation was introduced.