scariest sound i'd ever heard. >> the destroyed jet's wreckage spills over the top of a ridge. tragically if the jet had gained just 200 more feet in altitude they would have cleared the mountain. >> mercedes is trapped overnight in the wreckage. she finally comes to early the next morning. >> i was just asking god, you know, please give me a second chance. i just want to get off this mountain. just please, send people to save us. >> her prayers are answered when she hears a helicopter. >> i remember that two of the other survivors were jumping up and down and waving their arms. >> mercedes is too badly injured to get up but uses a shiny scrap of metal to alert rescuers to their location. >> i told them, i can't leave without my parents. >> mercedes doesn't know it yet