This article written by Justin Ho discusses how more and more shipping containers are falling into the sea.
"'Those are factors shipping companies can adjust, Villalon said, but it’s harder to plan for increasingly dangerous seas...The one variable here that we can’t control, which is new, is climate change,' he said."
While Anumá Aerospace airships certainly won't be immune to weather, a 4-day transit as opposed to a 20-day transit means your container has 20% of the probability of being lost at sea. Plus, there are no giant waves washing over the decks.