Secret Mission of Air Force's X-37B Robot Space Plane May Go Into Overtime

After nearly seven months of flight, the U.S. Air Force's latest X-37 robotic space plane is nearing a milestone in its secret mission in Earth orbit as it chalks up mileage and operational experience.As of last week, the reusable X-37B space plane had been in orbit for more than 206 days, two months shy of its 270-day mission design lifetime. The spacecraft, which looks like a miniature space shuttle, launched on its clandestine mission on March 5 from Cape Canaveral, Fla.The space plane is

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