limited air traffic control services puts additional workload on the pilots. >> the weather in cali is come and clear so the air traffic offers a straight in approach to runway 19. the crew accepts the runway change even though first officer williams says they'll have to scramble to make it in time. >> a runway change is not an unusual circumstance. the thing that you have to recognize is if it shortens the distance that you have to fly to get to the end of the runway, can you get down in time. >> the jet is descending more than 1400 feet a minute, as pilots fall further and further behind their landing checklist. suddenly flight 965's ground proximity warning system sounds in the cockpit. >> pull up. >> pull up. >> they're a few hundred feet from a mountaintop and coming down fast. the 757's engines accelerate as the captain tells his first office tore pull up.