[EQAndyBuzz]

I wouldn’t worry about the blade so much as I would worry about the handle. That looks like something you use to shatter glass. At 37,000 feet, knocking out a window would be more devastating then trying to swing a sword.

[Does so]

"...At 37,000 feet, knocking out a window would be more devastating then trying to swing a sword..."

That's Hollywood...

:-/

[Pecos]

"At 37,000 feet, knocking out a window would be more devastating then trying to swing a sword."

Completely debunked on Myth Busters. If, on the other hand, you knock out the airplane's window with a sizable bomb, the resulting hole could be a problem.