1.   The damaged plane spiralled to the ground.

2.   The trials also involved asking a pilot to land a damaged plane using the flight simulator.

3.   How would these damaged planes used to arrive at the airport?

4.   A software co-pilot can rapidly learn to fly a damaged plane.

5.   But American officials immediately focused their attention on an airport in the city of Lingshui, on Hainan, where the damaged plane was sitting on the tarmac.

6.   The collision resulted in the death of the Chinese pilot and left the damaged U.S. plane and its crew stranded in China.

7.   The damaged U.S. plane made an emergency landing on Hainan Island, setting off a diplomatic crisis.

8.   The damaged American plane made an emergency landing at a Chinese military airfield, which the Chinese call an illegal infringement of its territory.

9.   The damaged plane remained in China, but U.S. diplomats in Beijing said the crew had destroyed much of its secret material before surrendering.

10.   The fate of the damaged U.S. plane, which remains on the tarmac at a military base in Hainan, was also unclear.