Boeing to halt X-66 development, narrow focus to thin wings for future jets

Boeing this summer will stop developing NASA's X-66 truss-braced-wing demonstrator aircraft and shift its focus specifically toward developing thin-wing technology that had been central to X-66's design.

https://www.flightglobal.com/airframers/boeing-to-halt-x-66-development-narrow-focus-to-thin-wings-for-future-jets/162745.article