 Later, in 2017, proposed a modular aircraft concept.Carpinteria, California-startup Dorsal Aircraft wants to make light standard ISO containers part of its unmanned freighter structure where the wing, engines and tail are attached to a dorsal spine fuselage.Interconnecting long aluminum containers carry the flight loads, aiming to lower overseas airfreight costs by 60%, and plan to convert a C-130H with the help of Wagner Aeronautical of San Diego, experienced in passenger-to-cargo conversions.