For most people, how much they know about airplane travel is somewhere between "blissfully unaware" to "aware that they're flying through the air in a metal tube and that's it, thank god." I wish I could say that there's a benefit to knowing more about the experience, but according to the airline employees who shared their employer's biggest secrets on Reddit, being ignorant might be more of a luxury than traveling in first class. I know I wish I could unread some of these things. 1.) The pillows and blankets that flight attendants hand out are often reused. 2.) Not...