1.   ABC News has reported that the missile theories are groundless.

2.   According to an FBI affidavit, Elizabeth Sanders asked Stacey to help her husband investigate the missile theory.

3.   But the officials said that other findings had made them skeptical of the missile theory.

4.   But the missile theory is problematic.

5.   By late July, Kallstrom had doubts about the missile theory, but he never completely let go.

6.   Salinger became a spokesman for the missile theory when he mentioned it in a speech in November, saying he had received information supporting the theory from intelligence agents.

7.   Several senior crash investigators said they were outraged that Salinger had told reporters that the FBI had asked him to investigate the missile theory.

8.   Some safety board officials say they long ago put the missile theory to bed, but the FBI is adamant that it is still a possibility.

9.   Some investigators at the safety board say, with annoyance, that the airline has been trying to keep a missile theory alive.

10.   The government has yet to determine the cause of the crash, but has rejected the missile theory and says its tests show that the residue is fabric glue.