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
The most famous airplane flight of all time took place on May 20-21, 1927, when Charles A. Lindbergh became the first person to fly solo across the Atlantic, flying from New York Paris in a custom-built Ryan monoplane, the Spirit of St. Louis. Read about Lindbergh and his flight here.