I'm curious, how does a flight crew not notice a window entirely missing?!? I get that most of the passengers were near the middle of the craft, but wouldn't it still have been fairly noticeable as the flight attendants were walking down the aisle? Or immediately upon takeoff? Why did it take them reaching 13,000 before it was obvious a window was not there? TFA doesn't really say.
My only guess is that the shades pulled down on most of the windows, not making the situation apparent. But even then, it one would imagine a substantial rattle from wind. Even cracking the window of my car at high speed is incredibly noisy, and my car can only go the fraction of the speed of an airplane. This whole thing is confusing.