Oh, of course, but I mean for moving people who want to move around. Someone else observed that ocean liners are less efficient than planes, so if you wanna go overseas there's no alternative.

Except, of course, for business meetings which can be virtual (or just an email). I'm asking what's a practical alternative assuming we still want people to be able to go overseas. I agree for land routes high speed rail is better, too. I don't really understand my downvotes just for asking about alternatives.