Marking 100 years of man's success in conquering the skies, 2003 saw milestones for both what has been done and what is yet to come. Celebrations throughout the year culminated in the Dec. 17 anniversary of the Wright brothers' first successful powered flight at Kitty Hawk, N.C., a feat which set in motion changes that are still being felt and improved upon today. In the century since that flight, worldwide air travel has become common; space travel has moved from science fiction to reality; and air power has altered warfare. Although the Centennial of Flight marked a success, the year...