1.   Investigators theorize that this occurred because one pilot was pushing forward, to make the plane dive, while the other pulled, to make it climb.

2.   Then come two minutes of almost double gravity as the plane dives, levels off and begins another climb.

3.   Air traffic controllers guide the pilots of large-bodied aircraft through a gorge and the planes then dive toward the runway.

4.   The agency quoted eyewitnesses as saying they saw the plane dive into the river and explode near a bridge.