If the cost of international flights drops to the $300 to $400 range instead of $700 to $1500 or more and better cabin air pressure means no jet lag, then shorter one week international vacations would open up as a far bigger market and more frequent option.

2017-09-05:

After 2050, there will likely be 6-7B people that are the equivalent of today’s developed world middle class or affluent class. 2 to 4 trips per person per year is not inconceivable (higher incomes and low transportation costs). This would be 12-28B international arrivals.

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