![](https://i.kinja-img.com/image/upload/c_fit,q_80,w_636/42f464335a1064a028d322a42691e4fd.jpg)
The world got an uncomfortable reminder about the need to scrutinize air travel last January when a door plug blew off an Alaska Airlines flight 16,000 feet over Portland, OR. The culprit was a Boeing 737, and in the days that followed, it was soon clear that catastrophic failure wasn’t a freak accident but the result…