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Just as is the case with every job, they've got to have a bit of fun to see them through the working day.
No, we're not talking about the 'Mile High Club' - minds out of the gutter, please.
We're talking about a little known game that involves flight attendants using a special code word to convey to their colleagues their feelings about someone.
The rules are simple - every time a cabin crew member sees a passenger they think is attractive, they say 'cheerio' while keeping a straight face.
The game only works, of course, when the passengers are leaving after the plane has landed and the staff congregate at the door to say goodbye.
If they just walked down the aisle mid-flight shouting 'Cheerio' every now and then it wouldn't exactly be incognito.
The in-joke was revealed by an anonymous crew member on UK plane staff forum cabincrew.com.
"There's the cheerio game you can play when passengers disembark," they wrote.
"When you're standing there going 'buh-bye, thank you, take care' etc when you see someone you fancy, you say 'cheerio'."
"You need to do it with a buddy and the challenge is to keep a straight face."
So next time you're on a flight and one of the staff members says 'cheerio' on your way out, you may just have scored some points.
While this game is just a bit of light-hearted fun, some cabin crew code words are a bit more macabre.
For example, one person who claimed to be a ramp agent for a US airline took to a Reddit thread asking people to reveal secrets passengers don't know.
If you ever hear 'HR' on the radio, just be aware that there might be an extra passenger on board.
"A lot of freight gets shipped on commercial flights," wrote user /mrmiguez.
"One of these items was always called HR on the radios. HR was an abbreviation for 'Human Remains'.
"Some people die far away from where they want to get buried. They're packed in wood-framed boxes, so you would never know what was inside except by the strange shape of them."
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