impacts the ocean at a very high speed. in the wake of the swiss air 111 crash, the airline industry is forced to re-evaluate the procedures for in-flight buyers. flammability testing becomes more rigorous. insulation blankets and more inspected for more flame resistant materials. and wiring becomes more stringent. >> swiss air 111 was a watershed in how pilots deal with in-flight smoke conditions. after that pilots recognized how quickly things could go wrong. >> what makes fire such a lethal threat to aircraft is its ability to grow and start undetected. in some cases, the interiors of the plane are at risk, bought fire that starts outside can be