4 times the room = 4 times the cost. As for faster aeroplanes. Ye olde speed of sound limits the speed. To go faster, you need a tougher plane with different, less efficient engines (no big round fan, it would shake to bits). Hence the Concorde costing you all the francs in France but just holding a hand bag. The newer 787 type planes promise to be up to 20% more fuel efficient.
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4 times the room = 4 times the cost. As for faster aeroplanes. Ye olde speed of sound limits the speed. To go faster, you need a tougher plane with different, less efficient engines (no big round fan, it would shake to bits). Hence the Concorde costing you all the francs in France but just holding a hand bag. The newer 787 type planes promise to be up to 20% more fuel efficient.