Did you know that the two pilots on a flight are served different meals and cannot share in case they are struck with food poisoning? Or that there is a 30 per cent chance your pet is terrified before it even gets on the plane?
A fascinating Reddit thread asking flight attendants to share the secrets air passengers don't already know has received thousands of comments.
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On how your dog really feels about flying, one anonymous insider says: "If you checked your dog there's about a 30% chance it's terrified before it even gets on the plane, who knows how scared it gets during the actual flight.
"Bag room agents will usually try to comfort a scared animal, but all we can really do is talk to it, so if you write your pet's name on their carrier it usually helps a lot."
Another confessed: "There is a small latch hidden inside the lavatory sign on the bathroom door, which will open the door when pulled, even when it's locked. Airplane Peekaboo!"
According to one user, if the cabin were to depressurise, there is only 12 minutes of oxygen available from the masks.
They add: "This needs to last for the descent from the depressurisation (usually flying at just under 40k feet altitude) to a 'safe' altitude of 10k feet, this time includes a hold at 14k feet of around seven and a half minutes.
"Also, the reason why they tell you to put your oxygen masks first and then assist children is because at an altitude of 40k feet you will only have 12-20 seconds of breathing normal air before you become unconscious. There is no problem if a child becomes unconscious for a few seconds as they will regain consciousness when the oxygen mask is put on."
Another revealed: "The coffee is absolutely disgusting because the no one washes the container that goes out every morning."
But one of the most worrying secrets revealed: "That there's a huge list of things that can be missing from the aircraft while still being allowed to fly."