DALLAS (AP) — Travelers who counted on Southwest Airlines to get them home suffered through another wave of canceled flights Wednesday, and pressure grew on the federal government to help customers get reimbursed for unexpected expenses they incurred because of the airline’s meltdown.

Exhausted Southwest travelers tried finding seats on other airlines or renting cars to get to their destination, but many remained stranded. The airline’s CEO said it could be next week before the flight schedule returns to normal.

Adontis Barber, a 34-year-old jazz pianist from Kansas City, Missouri, had camped out in the city’s airport since his Southwest flight was canceled Saturday and wondered if he would ever get to a New Year’s gig in Washington, D.C.

“I give up,” he said. “I’m starting to feel homeless.”

By late morning on the East Coast, about 90% of all canceled flights Wednesday in the U.S. were on Southwest, according to the FlightAware tracking service. Other airlines recovered from ferocious winter storms that hit large swaths of the country over the weekend, but not Southwest.

The Dallas airline was undone by a combination of factors including an antiquated crew-scheduling system and a network design that allows cancellations in one region to cascade throughout the country rapidly. Those weaknesses are not new — they helped cause a similar failure by Southwest in October 2021.

The federal government is now investigating what happened at Southwest, which carries more passengers within the United States than any other airline.

In a video that Southwest posted late Tuesday, CEO Robert Jordan said Southwest would operate a reduced schedule for several days but hoped to be “back on track before next week.”

Jordan blamed the winter storm for snarling the airline’s “highly complex” network. He said Southwest’s tools for recovering from disruptions work “99% of the time, but clearly we need to double down” on upgrading systems to avoid a repeat of this week.

“We have some real work to do in making this right,” said Jordan, a 34-year Southwest veteran who became CEO in February. “For now, I want you to know that we are committed to that.”

Transportation Secretary Pete Buttigieg, who has criticized airlines for previous disruptions, said that “meltdown” was the only word he could think of to describe this week’s events at Southwest. He noted that while cancellations across the rest of the industry declined to about 4% of scheduled flights, they remained above 60% at Southwest.

From the high rate of cancellations to customers’ inability to reach Southwest on the phone, the airline’s performance has been unacceptable, Buttigieg said. He vowed to hold the airline accountable and push it to reimburse travelers.

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“They need to make sure that those stranded passengers get to where they need to go and that they are provided adequate compensation,” including for missed flights, hotels and meals, he said Wednesday on ABC’s “Good Morning America.”

In Congress, the chair of the Senate Commerce Committee also promised an investigation. Separately, two other Senate Democrats called on Southwest to provide “significant” compensation for stranded travelers, saying that the airline has the money because it plans to pay $428 million in dividends next month.

Leaders of Southwest’s labor unions have warned for years that the airline’s crew-scheduling system, which dates to the 1990s, was inadequate, and the CEO acknowledged this week that the technology needs to be upgraded.

The other large U.S. airlines use “hub and spoke” networks in which flights radiate out from a few major or hub airports. That helps limit the reach of disruptions caused by bad weather in part of the country.

Southwest, however, has a “point to point” network in which planes crisscross the country during the day. This can increase the utilization and efficiency of each plane, but problems in one place can ripple across the country, leaving crews trapped out of position.

Barber, the musician from Kansas City, already missed a performance Sunday in Dallas but had hoped to make it to Washington in time for a New Year’s performance near the National Mall.

“I’m missing out on money,” he lamented.