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It all comes down to the cost of a seat-mile
The question is can such a design be scaled up to carry enough passengers to be worthwhile, and can it be built and maintained economically. The Concorde was a commercial failure not just because the its fuel burn and sonic boom that limited it to exclusively overseas routes, but because the cost of building them was astronomical, and it carried too few people.
Posted by JohnMcGrew@...
20th Mar 2012