Image: Library of Congress
7. October 17, 1913: Imperial German Navy L 2 (Zeppelin LZ 18)
Zeppelin LZ 18 was one of 14 Zeppelins purchased by the German Navy ahead of WWI. Up until this time, Zeppelins were operated by the world’s first commercial airline company, Deutsche Luftschiffahrts-AG (DELAG), and were used to transport paying passengers.