NASA STARC-ABL: fuel burn reduction, same range, speed, airport infrastructure. Same turbine/airframe technology, Advanced 2-3MW power system, BLI, turbogenerator integration.
Boeing SUGAR Freeze
Boeing SUGAR Freeze: fuel burn reduction 56% for 900 mile mission, utilizes a truss-braced wing combined with a boundary-layer ingesting fan in an aft tail cone to maximize aerodynamic efficiency. The aft fan is powered by a solid oxide fuel cell topping cycle and driven by a superconducting motor with a cryogenic power management system.