Claim: Hans Berr was a German flying ace, born in the 19th century and serving in the 20th century.
Evidence: Oberleutnant Hans Berr (20 May 1890–6 April 1917) was a German professional soldier and World War I flying ace. The 19th (nineteenth) century began on January 1, 1801, and ended on December 31, 1900. The 20th (twentieth) century began on January 1, 1901, and ended on December 31, 2000. 1908 - 1917