Nuclear ocean liners would need substantial government support, but this has been true of all international travel since at least 1900. The ocean liners of the

Nuclear ocean liners would need substantial government support, but this has been true of all international travel since at least 1900. The ocean liners of the golden age were financed by governments, and modern jet travel is supported by large state investments into things like air traffic control, R&D, and airports. All that is really needed is the political will, which is a much better situation than the alternatives, which require extreme engineering that comes close to the limits of physical possibility.