If you've ever noticed a little exhaust hole at the rear of a large passenger plane and wondered what it was, that's the location of the plane's APU, or auxiliary power unit. The APU is found on ...

It's called the auxiliary power unit, and it's the smallest engine on the plane. But that doesn't mean it serves a small purpose. It provides the necessary power to start the plane's engines and ...

Following the trial on 57 aircraft operating out of and into Milan Malpensa’s Terminal 2, which is fully operated by easyJet, ...