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Viral video shows American Airlines agent refer booted passenger to a different carrier

"I'd suggest Spirit," the agent told the passenger after the airline said she called an employee a vulgar name and failed to comply with the federal mask mandate.

Viral video captured an American Airlines passenger being booted off a Texas-to-Florida flight after she allegedly refused to properly mask up and then uttered a vulgar term at a female employee.

The action unfolded Saturday at Dallas-Fort Worth International Airport as passengers boarded Flight 2823 to Miami, which was running four hours late due to a maintenance issue, traveler Chris Freeman told NBC News on Thursday.

An agent spotted the female passenger wearing a "fabric mask with rhinestones" that had holes in it, he said.

"They were boarding us and the lady got to the front of the line and the gate agent said, 'That mask isn’t gonna work,' and she said, 'Why not?' and the agent said, 'It has holes in it. It’s just cloth, and that isn’t gonna work,'" Freeman, a 39-year-old Dallas resident, said.

The passenger put on a paper mask that was handed to her and boarded the flight but was brought back up the jet bridge minutes later, according to the witness.

The gate agent was recorded calmly telling the woman, "You called my employee a b----."

“Completely uncalled for and inappropriate. You're not going to travel," the agent continued. "We don’t tolerate that crap with us at all. So you can find another carrier to fly with. I'd suggest Spirit."

American Airlines planes stand at Dallas-Fort Worth International Airport on April 6, 2018.Patrick T. Fallon / Bloomberg via Getty Images file

The agent told the woman she was spotted taking off the paper mask handed to her and putting on the bedazzled covering the airline had ruled out minutes earlier. NBC News does not know what actually happened on the plane.

"If you don't want to follow a federal mask mandate and then on top of that calling a vulgar name to my employee, that's not going to happen," the agent said in video footage that had drawn more than 4 million views by midday Thursday.

The woman denied she used profanity, but the agent said he didn't believe her, the video showed. At one point of the debate, Freeman said the woman tried to drop names.

"I know people in TSA," she said, according to Freeman.

The agent allegedly replied: "Well you can call them. They’re not going to be able to do anything."

The woman, wearing blue yoga pants and a North Face jacket, has not been identified.

In a statement to NBC News on Thursday, American Airlines confirmed that a traveler was removed from the flight "after failing to comply with the federal mask mandate and addressing one of our team members using profane language."

"We expect our customers to comply with our policies and treat everyone with respect when they choose to travel with us, and we take action when that is not the case," the statement continued.

Maya Brown contributed.