China's delivery delays look set to hurt Boeing's cash flow, and this could get much worse if more countries start delaying.

Transonic truss-braced wing project is on hold after Boeing proposes to investigate a simpler, thin-wing design.

Based on a heavily modified McDonnell Douglas MD-90, the X-66 was intended to demonstrate a truss-braced version of the thin wing at full scale. The experimental aircraft formed the flagship of NASA’s ...