An unhinged passenger aboard a Brussels Airlines flight attacked a flight attendant after she slapped him for yelling and spitting at her for allegedly refusing to help his mother-in-law as she was being “elbowed” by two men, according to a report.

A wild video shows the irate passenger screaming at a male flight attendant who was trying to get him to sit down, the Sun reported.

“You don’t put your hands on me!” the passenger is seen yelling in the video shot by his wife as the crew member tells him to “calm down.”

The man threatens to “beat the s–t out of” the flight attendant as his wife screams that the crew member had attacked her hubby first.

The melee escalates when a cabin supervisor tries to ease tensions before the man tells her to “shut the f–k up!”

“You listen, and you calm down,” the supervisor tells him, pointing her finger and threatening to call the cops.

Moments later, the supervisor wipes the passenger’s spit off her face and then slaps him. He retaliates by striking her in the face.

Another passenger then enters the fray and restrains the man — prompting his wife to yell, “Get the f–k off him!”

The woman who shot the video, Carmen Moore, wrote: “The man is complaining about TWO men who were sitting on the sides of his Mother-in-law and elbowing her as she was sitting in the middle seat.

“The man complained to the supervisor and was told they didn’t have to help him,” she wrote. “The female Supervisor proceeded to defend the men who were elbowing the woman when the man said something to the supervisor.

“She slapped him. The men who jumped on him broke his ribs and the police drug him down the plane’s steel stairs despite the man asking for medical attention prior,” she said.

Brussels Airlines did not immediately respond to a message for comment.