The U.S. Department of Transportation (USDOT) has initiated a probe into the rewards programs of the four largest U.S. airlines: American Airlines, Delta Air Lines, Southwest Airlines, and United Airlines. The focus is the prevention of deceptive, unfair, or anticompetitive practices. U.S. Secretary of Transportation Pete Buttigieg has directed these airlines to submit reports and records detailing their rewards programs, policies, and practices. The goal is to protect consumers against extra fees, hidden pricing, reward devaluation, and....