`de Havilland Comet`

Brief contrast to Aloha — the 1950s British Comet's square windows caused stress-concentration fatigue cracks leading to mid-Atlantic disappearances. Reason airliners no longer have square windows.

To give you a similar example — anybody remember Aloha Airlines? Got to do something for Adrian, the aerospace industry, because other people during the school year could be watching this and they might be in the automotive business. Aloha Airlines, the one with the window —

Student: Crack?

What you're thinking of is the Comet, which was the 1950s. They had square windows on this British-designed aircraft, flying across the Atlantic, and they would just disappear in the Atlantic, because they were getting fatigue cracks from stress concentration in the corner. You will not see square windows in airplanes since then. But this — the top of the aircraft, more than 180 degrees, top half — section just blew off. The only person who died was one stewardess who wasn't belted. Everyone belted in survived. 40,000 feet, the top blows off. I was impressed the whole thing didn't break in two. If you Google Aloha Airlines, there'll be a picture of it sitting on the ground, and over half the top is gone.