Why aren’t we using ground-effect airplanes in Ocean travel

Question

If ground effect are so much more efficient why aren’t we using them for flights, from Europe to the US for example?

In: Engineering

Answer 1

#the big one is speed at 30,000+ feet altitude is 550-600 mph,

so ‘efficiency’ yeah but also so your cross pacific flight didn’t take 33 hours at 240mph at sea level

and bad weather avoidance.