Consumer advocates are protesting a move by the Trump administration that they say will make it harder for the government to punish airlines that treat passengers unfairly.

On the Friday during a four-day Thanksgiving weekend, the Transportation Department made final its proposal for defining unfair and deceptive practices by airlines.

The rule deems that airline policies – around things like how ticket prices are advertised – are unfair only if they cause unavoidable and “substantial injury” that isn’t offset by some benefit. That is a high bar, in the view of consumer advocates.

In addition, the rule lets airlines request a hearing before the department issues new regulations.

Charlie Leocha, a travel consumer advocate, said the agency's rule could clear the way for airlines to go to court and overturn regulations that require them to advertise the full cost of tickets and to give passengers a chance to return to the gate if planes are stuck on the ground for hours.

Under the new rule, “airlines can do anything they want in terms of passenger protection with no worries,” he said. “This is not good for consumers, and it is a big win for airlines.”

The Transportation Department said it received 224 comments, with about 180 of them filed by individuals who argued that the proposal weakens consumer protection. The two Democrats on the Federal Trade Commission also criticized the proposal — commissioner Rebecca Kelly Slaughter wrote that the rule “will seriously hamper the Department’s ability to fulfill its statutory mission of protecting aviation consumers.”

The rule was praised by Airlines for America, the main trade group for big U.S. airlines, which argued that current regulations can be arbitrary.

“This reform is a critical step forward in ensuring a data-driven regulatory process, which will produce widespread and lasting benefits for air travelers, airlines and the economy,” the group said in a statement.

The Transportation Department, led by Trump-nominated Transportation Secretary Elaine Chao, acknowledged drafting the rule in response to a request from the airline trade group and a 2017 Trump executive order that urged agencies to reduce regulations.

The Transportation Department will soon will be under new leadership after President-elect Joe Biden is sworn in. Consumer advocates believe the Biden administration will be more pro-consumer. However, even if Biden’s people want to reverse last week’s decision, now they will have to go through a long rule-making process to do so.

The airlines have chafed for years under an Obama administration rule that requires them to use the all-in price — including any mandatory taxes and fees — when advertising airfares. The carriers say that's unfair because retailers and other businesses can usually advertise prices before taxes and fees.

If the Biden administration is unable to reverse last week's rule, “it's likely consumers will find shopping for flights to become more confusing and frustrating,” said Henry Harteveldt, a travel analyst with Atmosphere Research Group in San Francisco.

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David Koenig can be reached at www.twitter.com/airlinewriter