21. Other types of rigid airships that are also sometimes referred to as zeppelins are not included. 22. Consortium Rigid Airship Design was established on 26 May 1998 but went bankrupt 1 August 2001. 23. The " Los Angeles " became the longest-serving rigid airship ever operated by the US Navy. 24. As a result, rigid airships are called zeppelins. 25. Although the disaster ended commercial travel on rigid airships , zeppelins lived on for three more years. 26. The "'23 class "'were rigid airships produced in the United Kingdom during the First World War. 27. How do Rigid airships ( e . g. 28. In 1944, NAS South Weymouth was the starting point for the first transatlantic crossings of non-rigid airships . 29. The United States Navy ( USN ) hoped to use the V-1710 in its rigid airships NA-73. 30. Actual construction then started of what was to be the first successful rigid airship , the Zeppelin LZ1.
