Those mini bottles of alcohol on airplanes may be enticing, but don’t overdo it. A flight attendant can, and will, cut you off if you’re getting a little too buzzed. It’s actually illegal to be intoxicated on a plane and it’s illegal for flight attendants to enable passengers to get drunk.

The Telegraph
You can get up to a two-year sentence for the criminal offense of being drunk on an airplane. If that puts a damper on your travel fun, just remember: the changing cabin pressure means each glass of alcohol will affect you more than it would on land.
26. What Exactly is in the Baggage Compartment?
If you’re one of those people who watch the luggage get loaded into the cargo hold, you might notice some odd-shaped containers. Truth be told, it’s not just passenger baggage that’s transported in the underbelly of commercial airliners.

Quora
Among the freight that gets shipped on planes are human remains (or “HR” on the radios). That may sound disconcerting, but when people die abroad, their remains need to be repatriated. You wouldn’t necessarily know this was the case unless you spotted a particularly-shaped wood-framed box.