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Maybe international travel will become a thing of the past unless you are ultra wealthy , and any mass international travel will resort back to sea travel , perhaps by high speed ocean liners (no reason why this can't happen and it's certainly more fuel efficient to transport several thousand people at a time , or several hundred thousand tons of what ever by sea than by air.
Nor is there any real reason why the hydrogen cycle can't be rolled out over a very short period (under a decade) if the will and desire is there - it's Big Oil and car manufacturers who are dragging the chain on this. Ineffectual national governments of all complexions have a lot to answer for too.
No reason why ships can't use hydrogen as fuel , they are surrounded and float on rich source of the stuff.
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