Tips & News

The Extremely Important Reason Why Airplane Windows Are Always Round

And why you won't see sharp edges inside a plane, period.

Airplane Rounded Windows

Photo by Jag_cz/Getty Images Pro/Canva

By Stacey Leasca

Jan 10, 2022

WHILE BOARDING AN AIRPLANE, you might not notice much. Maybe you’ll glance at your ticket, look to find your seat number, and reach down to hoist your bag into a tight overhead bin before wrestling your way to your seat, where you’ll let out a little huff before buckling in. After that mini chaos is over, you can finally look up and take in your surroundings. And that’s when it could hit you: Everything on this plane is, in some way, round, from armrests to tray tables, television screens to windows.

Not only are airplane windows always round but also there are no sharp edges on any plane whatsoever, and there’s a very good reason why.

“Sharp edges hurt elbows, knees, hips… or any part of the body that they come into contact with,” Anthony Harcup, senior director at design house Teague, a design firm that has worked with Boeing for 75 years, told DMarge in a December interview. He explained, the rounding of edges is done for “delethalization,” a design principle that “ensures that when subjected to Murphy’s law, a passenger can’t hurt themselves on any part of the aircraft seat.”

Furthermore, Harcup notes, it’s not just for our protection, but for the plane’s as well. “Whether a part is molded, machined and painted, or covered in laminate, the finish is far more likely to get stress fractures or have the finish wear off at the high-point when manufactured with sharp edges,” he added.

Beyond looking good, rounded windows in particular keep us far safer in the sky than windows with sharp edges would.

As the Real Engineering YouTube explains in the above video, as passenger planes became more popular in the 1950s, airlines began to fly their aircraft at higher altitudes, which would allow for them to save money thanks to the thinner air, which creates less drag and a more comfortable ride with less turbulence. However, at the time, the airlines didn’t make the correct design changes to ensure passenger safety. They left in the fatal flaw of square windows, which created stress spots due to the pressure difference inside and outside the plane.

“When a material changes shapes like this, stress is created in the material,” the channel explains, “eventually the stress can rise so high that the material breaks.”

This is exactly what happened in 1952 when two planes disintegrated mid-air due to square windows. Don’t worry, we’ve come a long way in both plane safety and design since then. But now that you know the reason why windows are round, maybe next time you step on an airplane you’ll say a little “thank you” to designers and engineers for those curved edges so you literally and figuratively won’t hit any snags in the air.


Announcing the Winners of Asia’s Best Awards 2022

These are Asia’s best hotels, restaurants, bars and more, as voted by you.

Food & Drink

Sofitel Phokeethra Phnom Penh

When the Sofitel Phokeethra Phnom Penh opened its doors in early 2011, it became the first five-star hotel to open in the capital city since the 1990s.

Hotels & Resorts

These Are the Coolest Hotel X Artist Collabs Out This Year

Colorful things happen when artists and hotels work together.

Capella Bangkok

Tips & News

T+L It List 2021: These are the best new hotels in the world this year

Presenting the Travel + Leisure It List 2021

Cityscape of Oaxaca City, Mexico


World’s Best Awards 2022: Top 25 Cities in the World

The best cities in the world, as voted by our readers, are beloved for their mix of culture, food, and friendliness.