The United States should work on joint space projects with China, which is preparing to send its first person into space, the China chief of U.S. aerospace giant Boeing Co said Wednesday. “We really think it is a matter of NASA and what they want to do,” David Wang, president of Boeing China, told reporters. China is working on becoming the third nation to send people into space, and many analysts believe the mission could blast off around the country’s October 1 National Day.