The APU, or auxiliary power unit aboard an aircraft has a specific purpose, but also a pretty big drawback. Here's what you ...

The atmosphere is thin and cold the higher up a plane goes. The exhaust from a plane's engine is much hotter than the atmosphere. The water vapor from the hot plane engine turns to ice mid-air ...

When sitting in a landing plane, you might have noticed a backward force, pushing against the plane and slowing it down. What ...