Why Airplane Windows Are Round

Ever noticed airplane windows aren’t square? That’s not a design choice—it’s survival. Back in the early

days of jet travel, planes with square windows had a problem. At high altitude, the cabin is pressurized,

and pressure stresses sharp corners very unevenly. Stress builds up there… until cracks

form. Round windows spread the pressure evenly, like blowing air into a balloon instead

of a box. That simple curve keeps the plane strong, safe,

and in one piece at 35,000 feet. So next time you look out the window, remember—those curves

are quietly saving your flight. ✈️