The infamous Red Baron's life and career were both terribly short, but in that stretch of time, he gained a great deal of credit for shooting down an unheard-of number of planes. After a certain point, air force bombers were retired, at least until things really hit the fan at the end of the war. Young Von Richtofen was dead by then. He refused to retire.
I have marked this as a primary source, which is not really correct, since the man did not live to write his memoirs. It does contain a number of valuable primary sources, such as photographs and photographs of letters, and when my daughter and I did a home school assignment involving the First World War, this was a must-have, since she was interested in the air war.
If you search for sources on the Red Baron, you will be amazed how thin they are on the ground, given his fame. Part of the cost of losing a war is having a lot of your history gone, at least in many cases. This is a treasure.