NASA, US Air Force unveil new X-plane — the X-66A — to test wild wing design for fuel-efficient flight
NASA and Boeing's sustainable single-aisled plane has received an X-plane designation as it prepares to test technology that could reduce fuel consumption and greenhouse emissions.
TroibNews 
NASA and Boeing's sustainable single-aisled plane has received an X-plane designation as it prepares to test technology that could reduce fuel consumption and greenhouse emissions.
