"The air marshals and the flight attendants have legitimate concerns, certainly, for their own safety, but the threat of taking over a plane with a small, sharp instrument is zero, " Hawley said.

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The crater was extremely small, but eyewitnesses said they had seen both a plane and a missile.

ECONOMIST: On the very eve, Baghdadis were still optimistic

AeroVironment's remote-control attack plane may be small, but it represents a big shift taking place in the U.S. military: Today's defense robotics are more focused on killing and less dependent on humans than ever before.

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