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Those flight attendants who greet you while you board a plane aren’t just being friendly, according to a viral video. 

Flight attendant Kat Kamalani recently posted a TikTik video explaining what crew members are actually doing while they welcome passengers onboard a plane.

"Have you ever walked on a plane and saw the flight attendants standing right here greeting you?" Kamalani, who is from Salt Lake City, says at the beginning of the clip. "Or the flight attendants walking up and down the aisle. Well, I’m about to tell you what we’re really doing."

According to Kamalani, those are the moments that flight attendants are sizing up the passengers and looking for people who can help in cases of emergency

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"So when you’re walking on the airplane and you see our happy, smiley face, we’re actually looking you up and down and we are trying to find our ABS and what that is called is our Able-Bodied People, or person," Kalamani says. "So this is people who are going to help us in an emergency."

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She added that good examples of ABPs are military personnel, firefighters, pilots, police officers, nurses and doctors.

"So in case of emergency, like a medical emergency, or we are going to land the plane, or there’s a security breach, we know who’s on our plane and who can help us," Kamalani says.

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But that’s not all. 

Kamalani also said flight attendants are looking for "one more thing."

A flight attendant recently revealed that cabin crew members are eyeing passengers when they board to find people who can help in an emergency.

A flight attendant recently revealed that cabin crew members are eyeing passengers when they board to find people who can help in an emergency. (iStock)

"We’re looking for human trafficking," she says. "It happens a lot in the industry and our passengers’ safety is our number one priority, so we’re just looking for things that look off."

Overlaid in the clip, Kamalani wrote: "If you see something… SAY SOMETHING!!!"

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Since Kamalani posted the clip last week, it’s been viewed more than 2.8 million times. 

Having learned the flight attendants’ secret, a few commenters pointed out that they probably aren’t too impressive to crew members. 

"Them looking at me like….. ‘Ok useless,’" one person wrote. 

Someone else wrote: "So I’m pointless on a plane."

Another commenter said that if they were a flight attendant, they would keep an eye out for other things. 

"I’d be looking for the cute guys," the person wrote.