Airliner windows have rounded corners
Every passenger jet window is an oval, even though square windows would be easier to make and see out of.
Category: Getting about
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Feature. Sharp corners crack aircraft.
The first jet airliner, the de Havilland Comet, suffered two fatal in-flight breakups in 1954. Investigators traced the failures to metal fatigue that started at sharp-cornered cut-outs in the fuselage. Stress concentrates at corners, so airliners since have rounded openings.
Source: Metal fatigue, and the de Havilland Comet, Britannica. Also: de Havilland Comet, Wikipedia.