The Biden administration is enlisting the help of officials in 15 states to enforce consumer-protection laws covering airline travelers, a power that by law is limited to the federal government.

The U.S. Department of Transportation said Tuesday that the states, which include California, New York and Illinois, will help ensure that government enforcement activities keep up with a current boom in air travel.

Under an agreement announced by Transportation Secretary Pete Buttigieg, state attorney general offices will be able to investigate complaints about airline service. If they believe an airline violated the law or is refusing to cooperate with investigators, the states could refer cases to the Transportation Department for enforcement.

In return, the Transportation Department, or DOT, will give the states access to its consumer-complaint system and train state employees about federal consumer laws covering airlines.

“This is a partnership that will greatly improve DOT’s capacity to hold airlines accountable and to protect passengers,” Buttigieg told reporters.

Buttigieg pointed to travelers whose flights are canceled and then must wait days for another flight or pay more to fly home on another airline. “Things like that are a violation of passenger rights, and we are seeing far too many cases of that,” he said.

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Other states whose officials signed the “memorandum of understanding” with the Transportation Department are: Colorado, Connecticut, Maine, Maryland, Michigan, Nevada, New Hampshire, North Carolina, Oklahoma, Pennsylvania, Rhode Island and Wisconsin.

The District of Columbia and two U.S. territories also signed the agreement.

Buttigieg repeatedly cast the agreement as bipartisan, but only two of the state officials who signed on are Republicans. Buttigieg indicated his department is hoping to recruit more states.

Under U.S. law, the federal government alone regulates consumer-protection laws covering airlines. The carriers are not legally required to respond to state investigations.

Consumer advocates have pushed to expand enforcement power to the states. However, both the full House and a key Senate committee declined to include that proposal in pending legislation that covers the Federal Aviation Administration, part of the Transportation Department.

“During the pandemic, we actually got more complaints about airline traffic than any other topic, and it was frustrating” because the state had no authority to investigate the complaints, Colorado Attorney General Philip Weiser said.

Weiser argued that Congress should give states power to enforce airline consumer-protection laws, “but I have to say, we didn’t wait for Congress to act.”

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plus the District of Columbia, the Northern Mariana Islands and the U.S. Virgin Islands.