There are a growing number of recent comments from NASA officials and government notices that point to NASA plans for a piloted experimental X-plane to validate Boeing’s transonic truss-braced wing (TTBW) design as the possible template for a future smaller single-aisle. Boeing hasn’t decided on a path for its own development future, but the Biden budget priorities begin to put the U.S. government’s finger on the scale as a national stakeholder in the plane maker’s success or failure.
