But they may not be feeling so happy on the inside.

Flight attendants have revealed what they are really thinking about their passengers, what ticks them off the most and the secret codes they use to talk about passengers without them knowing, according to The Sun.

What annoys them the most?

An anonymous flight attendant recently revealed all to Popsugar.

“Discourteous passengers, touching the flight attendant to get their attention as we walk by, whispering (the plane can be very loud and I’m not the best at reading lips!), complaining about weather and/or aircraft maintenance delays (we don’t have any control over this, and we are just as inconvenienced as you are),” they said.

What they wish passengers knew

The same flight attendant also said: “We don’t choose what we serve — we simply show up and serve what’s there, and if it’s not there, you’re not getting any.

“We also have no control when it comes to delays due to weather and/or aircraft maintenance, so please be courteous to us in the event those may occur.”

The words they’ll use if they think you’re hot

A flight attendant recently told the Kyle & Jackie O show he had a secret way of speaking that pointed out attractive passengers on the plane.

“Obviously when we are in the cabin and we are doing the drinks we can’t just be like ‘Oh doll, check him out’. You have to be subtle about it,” he said.

“Because everyone knows their seat numbers, so we’re on the cart and he’ll be like, ‘I’m thinking of doing seven days in America … being ‘seat 7A’.

“And I’ll be like, ‘yeah, I could do seven days in America.’”

When they sneak a fart

During a flight, crew try not to pass wind in the tiny galley where their colleagues are taking a break.

Instead, they save up their gas and let it out while doing a walk through the cabin.

To do this, they walk slowly up and down the aisle, pretending to check whether the overhead cabins are properly closed and passengers are settled.

The practice is so common among flight attendants that they even have a special word for it — cropdusting.

Who they’d save first in an emergency

A flight attendant told VICE she thought about who she’d save first if something happened while she was bored during quiet stretches on long flights.

“I play ‘who I would save first’ a lot, like in the instance of an emergency landing,” she said.

“Obviously get the kids off first and all that.

“But it really does get boring up there — you spend a lot of time daydreaming, a lot of time staring at your passengers and mentally putting them in situations with you that would never happen.”

This article originally appeared on The Sun and was reproduced with permission.