How all 300 fliers escaped safely from burning jetliner

American investigators are helping probe the fiery crash-landing of an Emirates jet in Dubai. The Boeing 777 arriving from southern India burst into flames after hitting an airport runway.The FAA requires aircraft manufacturers to be able to evacuate a maximum number of passengers from their planes within 90 seconds. That rule applies to small regional jets, and is largely credited with helping all 300 people aboard escape from the wreckage in Dubai, reports CBS News correspondent Kris Van Cleav