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An "angle of attack" sensor built into the planes measures the amount of lift generated by the wings. The device warns pilots when there is too little lift, potentially stalling the plane, then points the nose of the plane down to gain speed.

An emergency notification requirement was added to the law in 2008, asking schools to alert the campus community of immediate or ongoing threats, in light of the Virginia Tech shooting in April 2007 — the deadliest school shooting in US history.

An investigative group set up by the CAAC had arrived earlier in Chengdu, Sichuan province, to look into the accident.

An Fengshan, a spokesman for the Taiwan Affairs Office of the State Council, said in a statement that expanding and intensifying communication and exchanges across the Taiwan Straits is the will of the peoples on both sides of the Straits, and is a mainstream trend.

An autonomous sense-and-avoid navigation system keeps the drone?from running into other objects on the way to its destination, at an altitude of up to 400 feet.?Researchers at the Massachusetts Institute of Technology showed off a sense-and-avoid system last month, but that one was designed to handle obstacles at a mere 30 mph?– half the speed that’s built into Amazon’s specs.