Now Boarding: Should you be worried about turbulence?

On this episode of "Now Boarding" Leslie and Erin discuss turbulence: what causes it, whether it's getting worse and why it's usually nothing to worry about. While serious injuries from turbulence are rare, it's always important to follow crew safety instructions. "Now Boarding" is a videocast about air travel and the business of flying. CNBC airlines reporter Leslie Josephs and CNBC senior producer Erin Black delve into topics like, airline status, boarding, jumbo jets and all things aviation.