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Novi Avion, a 1980s project intended to replace Yugoslavia's ageing fleet of Soviet fighters. with assistance from France, it was of similar configuration to the in-development Rafale and could have used the M88 turbofan. however, the breakup of the country ended the project.
F-117N, a navalized Nighthawk briefly studied in the wake of the A-12's cancellation. a redesigned wing and horizontal stabilizers were to facilitate carrier operations and more powerful F414 turbofans were to be fitted. ultimately, it was rejected in favor of the Super Hornet.
The Sukhoi T-12 was a strange twin-fuselage Close Air Support plane design that featured forward-swept wings and stacked turbofan engines that could shut off in flight to save fuel, and even considered Wing-in-Ground flight for further fuel savings.
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Euro hydro - Bauhaus Luftfahrt Hyliner (2.0) concept for 2040+ hydrogen-fueled long-haul airliner - 400 pax, 6,400nm, zero CO2 w turbofans; slower M0.7 cruise reduces fuel burn, enables low sweep, high aspect-ratio laminar-flow wing; double-deck fuselage for tanks - #AiaaAviation