Lothar the Lost - Lothar, #1

Lothar von Richthofen was an ace in the Great War with 40 victories. Time travelers arrived after the war to prevent an even greater war, and recruited him as a fighter pilot for their fleet. He had a successful career until he ran afoul of the new admiral, who exiled him a thousand years into the past for his mistake. Now he must make his way in the 10th century.