The first version will be sized as a 757 replacement but designed to be capable of being efficiently shrunk as a MAX-8 replacement. As a consequence, Boeing may do a B-717NEW to efficiently cover the 100-150 passenger band that the Bombardier CSeries and Embraer E-Jets cover.
Indications are it will have a composite wing for efficiency in production, and easier wing shaping. By this time, laminar flow technology might have already matured to be utilized.
Fuselage may remain aluminum of better alloys, and wider to take into account of obesity in the population. If more robust repair procedures for composites will become economical and widespread, a composite fuselage is possible. Specially if the weight and costs are more favorable.
New engines will be used, possibly unducted fan if noise and safety issues will be satisfactorily met.
Possible telescoping seat sets for wider aisle during loading and unloading for more flights per day.
If hardware and software can be developed to a robust level, a twin pilot B-797 is possible. One Human and One Electronic - Minus the Co-Pilot. This system can be integrated into Air Traffic Management to efficiently use routes, airport slots and the aircraft. A more robust and secure telecoms system has to be developed specially for this. It cannot be based on the open and non-secure Internet IP system.
A built-in electric taxi engine may be integrated to minimize use of main engines in moving around the airports.
More electronic entertainment and BYOD network in the cabin.
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