Category 1 is always the greatest level of hazard (that is, it is the most hazardous within that class). If Category 1 is further divided, Category 1A within the same hazard class is a greater hazard than category 1B. Category 2 within the same hazard class is more hazardous than category 3, and so on.
Correction: An earlier version of this story incorrectly stated that Charles Nungesser and Francois FranÃ§ois coli would have been the first pilots to make a nonstop transatlantic. Flight a pair Of british pilots made such a flight in. 1919
). Hers was the last step that had to be taken before commercial transatlantic flights began in the late 1930's -- twenty years after the first transatlantic crossing and thirty-five years after the Wright brothers. Still, Lindbergh's flight is what that riveted public aware-ness; and it's worth mentioning his airplane.