I think passenger ships are going to make a comeback at some point in the next 50y. International air travel is one of the few big climate impact vectors with no reasonable substitute. Domestic you have possibility of better all-electric high-speed rail...
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airships maybe three times faster
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speed is in the hundreds of km/h but nowhere near 900 like a passenger jet see stuff likehttp://aeroscraft.com/
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very small scale thinking solar doesn't provide enough continuous power; the correct choice is to use tethered kite turbines for both power and sometimes propulsion.
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Cruise ships 20 something mph. Airships maxed out in the 40s at about 4x that. Possibly faster now. Fast shipping is one of the primary CO2 generating industries though, right?
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there's a whole cottage industry making semi-buoyant rigid airships that get ~2/3 of their lift from helium and the rest from airfoil-like structures; the next step is to wallpaper them with PV
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