Its simply too expensive compared to the latest gen aircraft (A350/787) because of their lower fuel burn. https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft

Its simply too expensive compared to the latest gen aircraft (A350/787) because of their lower fuel burn. https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft