Southwest Airlines is scrapping another one of its longstanding, popular policies: free checked bags for all passengers.

The airline announced Tuesday that starting May 28, it will no longer automatically allow all passengers two free checked bags upon boarding, ending the hallmark “bags fly free” policy that has flown in the face of all other major U.S. carriers.

The decision follows Southwest ending its open seating policy, another popular feature among its most loyal customers, last year in a bid to boost revenue.

Customers who make bookings after the May deadline will have to pay for two pieces of checked luggage unless they have the airline’s top loyalty status or purchase tickets for the airline’s most premium seating, Business Select.

Customers who use a Southwest credit card or book the airline’s second-most premium seating will receive one free checked bag, the airline said.

The airline is also putting expiration dates on its flight credits, a practice it eliminated during the pandemic.

Southwest did not immediately reveal what it would charge customers for their checked luggage. A Southwest spokesperson told HuffPost, “Airlines are not permitted to speak in specific terms about future pricing, fares, fees.”

The airline was the last major U.S. carrier to allow free checked bags for all passengers. It had held the policy since its founding more than 50 years ago.

The company’s CEO, Bob Jordan, said as recently as September that he didn’t see the policy changing, calling it a “huge consumer advantage.”

“It’s the third thing customers look for after fare and schedule: Bags fly free, on us,” he told CBS News. “Ninety-seven percent are people who are aware of our policies. So it’s a huge consumer advantage. So bags will absolutely fly free.”

But airlines are currently grappling with a major drop in consumer spending and are reducing their growth expectations amid concerns about the economy.

American Airlines doubled its loss expectation on Tuesday for the first quarter, while Delta Air Lines cut its profit guidance in half, Bloomberg reported.

Elliott Investment Management, one of Southwest’s biggest shareholders, has been pushing to shake up the airline to revive its stock value. Critics have argued that the changes — like eliminating the free bag policy — strip Southwest of the identity that distinguished it from its competitors.

Last month, the airline laid off 1,750 workers — its first company-wide layoffs ever.