>> crm is basically promoted that if you're going to work together as a team you're going to make decision as a team. you come to a joint solution, not an individual solution that is then worked into the equation. >> up till that point, we only taught the technical aspects of flying. they had to stick to the other skills, but we never taught decisionmaking and judgment in a formal way. i got with one of the top air safety investigators with the board, and he said, al, if you can sell this to the board, this is going to be a revolutionary recommendation. >> the deadliest accident in aviation history provides diehl with even more compelling evidence to take to the safety board. in this disaster, two 747s collide in the canary islands in 1977. the accident kills 583 people and is blamed in large part on bad communication. >> the whole cabin next to me