She saw red.

Two American women were dragged off a British Airways flight by police after brawling over one of them wearing a bright red MAGA hat, according to a report.

The unidentified women — one in her 40s and the other in her 60s — started fighting at London’s Heathrow Airport on Monday afternoon as passengers were waiting to board their flight to Austin, Texas, according to the Sun.

One of the women demanded that the other take off her red cap with Republican presidential candidate Donald Trump’s “Make America Great Again” slogan written on it — with punches thrown when she refused, the report said.

The melee continued in the plane cabin where both were sitting in premium economy, prompting the captain to call authorities for help.

“Airline crew could not run the risk of a full-scale punch-up at 30,000 ft,” one source told the UK paper of the “extraordinary” scenes.

London’s Metropolitan Police arrived at Terminal 5 and hauled the women off the plane as they continued to shout profanities at each other, according to the Sun.

Neither were arrested, but were interviewed by police after they both made claims of affray, the Met police told The Post.

“Enquiries are ongoing,” the police department said.

The flight was delayed for more than two hours — and eventually took off for Texas without either of the two women on board.

British Airways officials could not recall a flight ever being delayed over a passenger’s hat, the Sun’s source said.

But “with the US Presidential election so close, tensions are sky high,” the source said.

British Airways told The Post in a statement that it apologized to its customers about the bizarre delay “and got them on the way as quickly as possible.”