Aircraft Trivia: Aircraft are balanced between cargo and passengers.

Meticulous attention is paid to the balance that determines the safe operation of airplanes. 

Any plane can't fly stable unless the weight of the plane is balanced front to back and left to right. The reason why passengers are weighed when they check their luggage is to adjust the area where the luggage is loaded so as not to upset that balance.

The same goes for the seating position of passengers and the number of passengers; if passengers sit too far forward or too far back, the balance will also be upset.

Therefore, no matter how many seats are available, shifting seats without permission is not permitted from a safety standpoint.

For example, in the case of a jumbo jet, the center of gravity of the fuselage is located slightly forward of the center of the fuselage, within a range of about 2 meters in front of and behind the center of the area where the main wings touch the fuselage. If the center of gravity deviates even slightly from this position, sensors are triggered and an alarm sounds, preventing the aircraft from taking off.

Of course, the mechanism is the same for other aircraft. The balance of an airplane is very delicate.


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