Sure, I like the alternative universe of Larry Correia‘s Hard Magic, in which dirigibles play a major role in travel and the military, but what would really be fun is an alternative post-WWII universe in which the weird aeronautical technologies developed before and during the war actually reached fruition.
Things like the Vought V-173 or Junkers G.38. Imagine what today’s passenger airliners based on these concepts might look like.