the plane is at 9,000 feet but the crew is unaware there's a towering mountain directly ahead. >> pull up! >> the first officer goes to full power and tilts the nose up so much a stall warning erupts in the cockpit. there's mayhem in the cabin. >> i just remember hearing people crying and screaming and i was terrified. >> mercedes' mother and father help prepare her for the worst. >> through all of that chaos i remember hearing my mom's voice, her voice calmed me down because she was actually praying. i was holding on to my dad's hand at the same time [siren sound] >> 12 seconds after the warning alarm goes off, the sound of splintering trees shatters the silence on a mountainside at 8900 feet. trees impale the jet's hull as 17,000 pounds of fuel explode on impact. >> it was just the loudest