Why airlines do not give umbrellas passengers?

NEWS ,

There are many unanswered questions every day about the reason for not granting airline passenger air umbrellas to use them during the exposure to the air in the plane accident
Where some believe that wearing the parachute and landing of the aircraft could save anyone from the process of the crash or explode in the air
But that all civil aircraft operating on the passenger transport from one country to another or from one city to another
Flying at high altitudes meaning it once you open the door of the plane in the air, will create a decrease in oxygen to a fatal degree that this plane was traveling at less than 370 kilometers per hour
But if the speed is the biggest anyone who will jump out of the plane will crash and immediately turns to pieces because of the severity of Aldaft

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