That might create enough force to suck something small out of the hole, like an unlucky carry-on. Airplane windows are round because that way, the air pressure is evenly distributed. If the windows were square, air currents would be able to find a weakness, and they’d crack easier. Loss of pressure can lead to something way more serious, an in-flight fire. And it’s not the only reason a fire would break out on a plane. But what happens when a plane goes on fire? How dangerous is an engine fire on a plane? And what are the common fire hazards in the aircraft?

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