Zeppelin isn't safe, slow and not effective for mass passenger transport.
Zeppelin can't hold many people in big city scale and/or short hop.
Did you know how many passenger that can loaded on?
Compare the volume of the Zeppelin vs the number of passenger. If I remember correctly, it only take 7 passengers and it is rather slow to land and take off. So you have a lot of wasted time.
This really does not scale well when talking about big conurbations with millions of people.
http://edition.cnn.com/2013/08/05/travel/paris-zeppelin-airs...
Compare the volume of the Zeppelin vs the number of passenger. If I remember correctly, it only take 7 passengers and it is rather slow to land and take off. So you have a lot of wasted time.
This really does not scale well when talking about big conurbations with millions of people.