[4] The design was presented at the January 2019 American Institute of Aeronautics and Astronautics (AIAA) conference and the wing folds outboard of the truss to enable its use of airport gates like the 118 ft (36 m)-span 737.

A full-scale X-plane is being developed and tested under NASA's Ultra-Efficient Subsonic Transport (UEST) plan, outlined in the New Aviation Horizons flight demonstration from 2023.

A 1.5 MW (2,000 hp) electric motor/generator mounted between the compressor and the variable pitch fan, fed by batteries to boost the takeoff and climb, allows for a smaller engine and improves efficiency by 4.5% over a 3,500 nmi (4,000 mi; 6,500 km) mission.

[9] Using a shortened MD-90 airframe and CFM International RISE engines, the demonstrator is scheduled to fly in 2028, providing the basis for a possible family of 130-to-210-seat aircraft.

[12] In June 2024, Boeing and Pratt & Whitney announced that a dedicated derivative of the geared turbofan (GTF) engine PW1500G/1900G series, named PW102XG, will be installed.