A Zeppelin is a type of rigid airship pioneered by the German Count Ferdinand von Zeppelin in the early 20th century. Zeppelin's ideas were first outlined in 1874 and formulated in detail in 1893. They were patented in Germany in 1895 and in the United States on 14 March 1899. After the outstanding success of the Zeppelin design, the term zeppelin in casual use came to refer to all rigid airships. Zeppelins were first flown commercially in 1910 by Deutsche Luftschiffahrts-AG (DELAG), the world's first airline in revenue service. By mid-1914, DELAG had carried over 34,000 passengers on over 1,500 flights. After the outbreak of World War I, the German military made extensive use of Zeppelins as bombers and scouts.
The World War I defeat of Germany in 1918 temporarily halted the airship business. But under the guidance of Hugo Eckener, the deceased Count's successor, civilian Zeppelins became popular again. In 1919 DELAG established scheduled daily services between Berlin, Munich, and Friedrichshafen. Their heyday was during the 1930s when the airships LZ 127 Graf Zeppelin and LZ 129 Hindenburg operated regular transatlantic flights from Germany to North America and Brazil. The Art Deco spire of the Empire State Building was originally if impractically designed to serve as a mooring mast for Zeppelins and other airships to dock at. The Hindenburg disaster in 1937, along with political and economic issues, hastened the demise of the Zeppelin.