Most travelers probably didn't give much thought to the security of airliner cockpits before the 9/11 attacks, and since then it might seem odd to some that cockpit doors are often left wide open ...

While boarding a plane, you may have noticed the cockpit door is often kept open—and there's actually a pretty straightforward reason. If you’ve ever looked toward the front of the plane while ...

Cockpit barriers are required to stay sealed during flight, but oftentimes passengers can get a glimpse inside while boarding CHARLY TRIBALLEAU/AFP via Getty Passengers can often catch a glimpse ...