Jetliner 'well below' ideal speed before San Francisco crash

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Speaking via satellite from the San Francisco airport on MSNBC’s “Morning Joe,” NTSB Chairwoman Deborah Hersman said it was clear already that the plane was not traveling fast enough to clear the runaway it crashed into on Saturday.

“I can you tell you they were well below 137 [knots],” Hersman said. “It wasn’t just give or take a few knots. Once we identify exactly what their low speed was, we’re going to put that information out.”

A knot is a unit of speed that is used to measure how fast airplanes are traveling. It is equal to one nautical mile per hour, almost 1,000 feet further than one mile per hour.

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