Lighter Than Air

In the nice to have department: Could we have gaseous hydrogen and helium as a lifting agent for lighter than air aircraft. Fuel tanks could have the option of being constructed of fabric or we could have gas envelope as a new structure. We could have a helium balloon floating in the atmosphere of Tydos, Urados or their moons. We could also build Zeppelins and pretend to be the Hindenburg or one of Germany's World War I bombers.