"The craft would carry 100 t (220,000 lb) in freight containers and unit load devices. It would be towed from a sea ports outside of territorial waters, mostly at 19 km (10 nmi) from shorelines, to takeoff within 6,000 ft (1,800 m) in a sea state swell up to 8 ft (2.4 m). It would fly across the Pacific ocean in 30 hours at 20,000 ft (6,100 m), well below passenger air traffic and would be towed to a sea port after landing. Made of carbon fibre and fibreglass composites, its production cost is estimated at $25 million, much lower than jetliners due to fewer onboard systems and no pilots, it would be powered by jet engines developed by Pratt & Whitney.
...
Natilus aims to ship 200,000 lb (91 t) from Los Angeles to Shanghai in 30h for $130,000 at $3 per gallon of jet fuel, while a Boeing 747 takes 11h for $260,000 and a cargo ship takes 504 hours for $61,000"
https://en.wikipedia.org/wiki/Natilus
...
Natilus aims to ship 200,000 lb (91 t) from Los Angeles to Shanghai in 30h for $130,000 at $3 per gallon of jet fuel, while a Boeing 747 takes 11h for $260,000 and a cargo ship takes 504 hours for $61,000"
https://en.wikipedia.org/wiki/Natilus