Robert Todd, 90, one of the last of the flying aces of World War I. In 1918, the 20-year-old Todd, flying a Sopwith Camel plane, shot down five German aircraft to qualify as an ace. He spent four months at the end of the war in a prisoner-of-war camp after being shot down but returned to active duty during World War II and served in England as commander of a staging area for gliders and powered aircraft. He was among 30 flying aces honored on Veterans Day in 1981 by French President Francois Mitterrand for their contribution to the war effort. In La Jolla, Calif., on Wednesday.