A lot of flying goes on behind the sᴄᴇɴᴇs. Even the most experienced travelers frequently have little idea about the vast world of procedures, laws, tricks, and codes. You’ll be more secure in your decision-making going forward the more you understand about flying. Continue reading to discover more about what flight attendants are keeping from you.

The supply of oxygen provided by those emergency masks only lasts for 15 minutes.
Everyone has heard the pre-flight instructions to put on a mask before aiding a child. The fact that the oxygen flow will only continue for 12 to 15 minutes is not disᴄʟᴏsᴇd. Before you start to worry, realize that the majority of pilots will descend the plane within that period. However, the most ᴅᴀɴɢᴇʀᴏᴜs time is within the first 30 seconds since you only have that much time to put the mask on yourself before you pass out.

In-flight chimes that play a secret code.
The chimes are used by flight attendants to communicate a variety of information, from limited snack supplies to increased turbulence. The chimes occasionally have more meaning, warning flight attendants of emergencies or changes in the route.

Flight attendants hate pouring Diet Coke.
This soda fizzes more than any other beverage. To the point where a flight attendant could pour three other drinks in the time it takes to pour one Diet Coke, Diet Coke requires extra time to merely wait for the bubbles to settle.

But if you ask, they’ll give you the whole can.
There is no restriction on how much you can consume; the typical beverage pour only covers half to three-quarters of a plastic cup. According to HuffPost, if you want the entire can, flight attendants will typically comply.

There are several secrets and highly private details on your boarding permit.
It becomes harder to read the codes on your boarding card. The PNR, or Passenger Name Reference, is a six-digit alphanumeric chunk of coded text that reveals your frequent flier number and upcoming travel intentions. It is the most intriguing—and secret—part of your ticket. According to CNN, someone may access your account using this information and change the PIN to prevent you from accessing it in the future.

The flight number is also coded information.
The first two letters of the flight code, which are simply the airline you’re booked on—for example, AA for American Airlines or NK for Spirit Airlines—are some of the information that is readily apparent on the boarding card. According to Gizmodo, the last digit of the flight code indicates the direction of the aircraft, with ᴏᴅᴅ-numbered flights pointing south and west and even-numbered planes pointing north and east.

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Video resource: DutchPilotGirl