Delta, Other Airline Loyalty Programs Are Being Probed by US (2)

The rewards programs of the four largest US air carriers — Delta Air Lines Inc., American Airlines Group Inc., United Airlines Holdings Inc. and Southwest Airlines Co. — are being probed by the US Department of Transportation, the agency announced Thursday.

The department has asked the airlines to submit reports on their programs within 90 days to give the government a better understanding of how consumers “are impacted by the devaluation of earned rewards, hidden or dynamic pricing, extra fees, and reduced competition and choice,” it said in a statement.

The probe would be the first extensive ...