Airplanes have become one of the commonly used means of transportation, bringing great convenience to people's travel, but do you really know the secrets behind the rules and common sense that seem to be taken for granted? This article will tell you a few airplane secrets, maybe some of which you are curious about.

1. Pilots are not allowed to have beards

Beards are considered by many people to be attractive to men, but among aircraft pilots, no one has a beard. What is the reason? It turns out that airlines prohibit beards, because in the event of an emergency, when an oxygen mask needs to be worn, the oxygen mask must fit the face very well, and it will be very inconvenient to have a beard.

2. The low temperature in the cabin is for the health of passengers

Many people complain that the plane is very cold when flying in the air, even in the hot summer, they will feel a little chill. Studies have found that when the plane is flying in the air, if the temperature in the cabin is higher, it will be more likely to cause hypoxia to passengers, especially some elderly people with poor hearts cannot adapt. Therefore, for everyone's health, the temperature in the cabin will be relatively low.

3. It is best to wear flat sneakers on the plane

For safety reasons, passengers are advised to put sandals or high-heeled shoes in their luggage. These two kinds of shoes are difficult to quickly escape from the plane in the event of an emergency. Wearing high-heeled shoes during the evacuation process cannot quickly pass through the emergency passage, and there is a risk of puncturing the evacuation slide. If you wear sandals, it is very likely that the high surface temperature or other complicated situations will hurt your feet during an emergency landing.

4. Plane delays affect not only passengers but also flight attendants

It is unavoidable that the plane will be delayed, and passengers can understand it under normal circumstances, but individual passengers have been irrational, and even made unkind words to the flight attendants, and even complained. In fact, the delay not only has an impact on passengers, but also has a great impact on these flight attendants. In the case of flight attendants, their salaries are calculated based on flight time, not time spent on the ground. Therefore, flight attendants are also "victims", so it's really unnecessary to get angry with them.

5. Why do crew members dim the lights when the plane lands?

One of the least known things about planes is that the cabin dims its lights during landings for safety reasons. Dim the lights as a precautionary measure to allow passengers' eyes to adjust to the darkness. In this way, if there is an accident during the landing, everyone's eyes have been adjusted and they can be evacuated. Of course, the chances of this happening are too low.

6. The oxygen mask can only be used for 15 minutes

There is an oxygen mask above every passenger on the plane for use in case of danger. Although many people know that there is an oxygen mask, they do not know how to use the oxygen mask and how long it can be used. Generally speaking, the oxygen mask is used for 15 minutes. Although this time is very short, it is enough for the pilot to lower the plane to a height where he can breathe on his own.