In a now-viral video garnering nearly 10 million views, an American Airlines pilot shared insight into what these mysterious ...

But now, one pilot is revealing exactly what those sounds mean—and the answer might surprise you. RELATED: 7 Clothing Items ...

As you're sitting on the plane and waiting for takeoff, your airline pilot could activate a "ding" sound mid-flight — but what does that sound really mean? In a now-viral video garnering nearly ...