What's Fascinating About Airplanes?

Most every main feature of an airplane has a redundant system. There are checkles for the pre flight, there's checkCheckles for the take off and when they're coming in for a landing. And those are the things that behind the scenes in the airplanes that we just don't know about because we're passengers. I'm not counting on an airplane for my content. If i want to watch a move, it's not going to be what's in the seat back.