There's a lot that happens on a plane which we might not be aware of.
Luckily cabin crew members often share flight secrets for those who are curious about what happens above.
Previously, a flight attendant explained the "hidden pin" behind the toilet sign.
Now if you're wondering how toilet waste leaves the plane, well we've got an answer for you.
Some people might think the waste is dropped out the bottom of the plane, but that's not the case.
For over 30 years, planes have used vacuum toilets so they don't have to carry unnecessary water which would add to the weight.
Gizmodo said: "Pressing the flush button opens a valve in the bottom of the bowl, exposing the contents to a pneumatic vacuum."
The science website added: "That vac sucks the load down the plane's sewer line into a 200-gallon holding tank."
Also the toilets have a sort of Teflon non-stick coating to assist in pulling the waste down.
Waste remains in the tank for the duration of the flight and is vacuumed out by crews on the ground.
If you're wondering if pilots could accidentally drop the waste in mid-air, don't worry there's an explanation.
Apparently there's a latch on the exterior of the tank so it can only be opened from the outside.
So next time you're on a plane and pop to the loo, you'll know what's happening.
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On another occasion, airline staff revealed whether spiders scorpions and snakes are on planes.
One person – who worked with animals – explained that it's not just beloved pets being loaded into the hold…
They wrote: "Having previously worked in animal care – live animals are common cargo.
"Lots of snakes though, constrictor and venom."
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