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There are only a limited number of airports that can handle the plane. It is a fuel guzzler. Because it is a four engine aircraft even on a short flight it requires a three person crew on the flight deck. The breakeven point for each flight is higher because of these problems and not every flight is a full or even three quarts fuel.
Both Airbus and Boeing have twin Engine planes that can fly as far or farther on less fuel and few flight deck crew. Both companies twin engine planes can supply airlines with point to point service for passengers on long haul flight to destinations never before serviced without one or more stop overs. Both of these companies have twin engine planes that can carry upwards of 400 plus passengers about 65 to 100 les then the a380 in a standard configuration and do so for about 15% less.
Last but not least having only one true customer means the customer sets the terms and conditions of purchase rather then the manufacturer setting the terms and conditions of sale. That is a bad business model.