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n the early 1990’s Boeing needed to find a replacement for the aging Boeing 767 which was experiencing a down turn in sales.
Two alternatives were investigated. The first was a sub-sonic cruiser which would be capable of cruising at Mach 0.98 for around the same fuel economy as that of the Boeing 767. This would be very attractive in being able to dramatically reduce journey times whilst staying below the speed of sound. This is important as the sonic boom generated by Concorde limited that aircraft to only being able to be operated over water and therefore making it unsaleable to most airlines. The sub-sonic cruiser did attract considerable interest from the market.
The second option was an up-sized version of the Boeing 747, the Boeing 747X. This was intended to be a competitor against the Airbus A380, however reception by the market for this solution was luke warm.
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