Most People Will Go Their Entire Lives Without Ever Knowing Why Airplane Windows Are Round

Each time an aircraft takes off and climbs, the fuselage expands slightly. Each time it descends and depressurizes, it contracts.

This constant expansion and contraction causes metal fatigue over time.

That’s why aircraft undergo rigorous inspection schedules, including:

Ultrasonic crack detection

X-ray scans

Structural reinforcement checks

Windows, because they interrupt the fuselage, are among the most carefully monitored areas.

Their rounded shape doesn’t eliminate fatigue—but it makes fatigue manageable and predictable.

Why Not Just Make the Fuselage Stronger?