These behaviors are on the no-fly list.

Amid an uptick in barbaric behavior in the air, flight attendants are decrying the appalling antics they’ve observed in flight — including messy sex sessions at 40,000 feet.

Buzzfeed recently asked crewmembers to name some of the most outrageous incidents they’d ever witnessed on the job, with several saying mile-high romps were an all-too-common occurrence.

“NEVER have sex on an airplane,” one flight attendant fumed, saying they’d seen far too many passengers getting frisky during their 28 years on the job.

“You wouldn’t believe how many people think they’re being sneaky, doing it under a blanket, and it’s obvious what they’re up to,” they lamented.

The Buzzfeed respondent was particularly appalled by passengers who make whoopie in the lavatory, which is where 59% of these raunchy rendezvous allegedly occur (presumably for privacy reasons).

“I don’t know how clean you think those bathrooms are, but I can assure you they are dirtier than that,” they exclaimed. “It’s disgusting, super disturbing to the other passengers, and more often than not, it leaves an unbelievable mess for cleanup. I don’t care how horny you are — save it for the hotel!”

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Meanwhile, other airline employees has gripes about different kinds of unsanitary actions.

“An alarming amount of passengers feel the absolute compulsion to floss their teeth or clean their ears in-flight and then just toss their floss or Q-Tips on the floor for me to clean up between turns,” one stated.

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Changing a baby’s diaper on the tray table is another all-too-common mile hygiene violation, according to another flight attendant, who wrote: “That’s where people eat! None of the passengers around you want to smell that.”

“Full recognition the changing tables on planes suck, but making everyone around you deal with that is incredibly selfish,” they added.