NASA's aircraft known as the Weightless Wonder VI lands for refueling at the Rick Husband Amarillo International Airport in Texas.

NASA's C-9 aircraft, also known as the Weightless Wonder VI, lands for refueling at the Rick Husband Amarillo International Airport in Texas on its way to NASA's Kennedy Space Center in Florida. The C-9, normally used to train astronauts by simulating zero gravity, was used as the support aircraft on space shuttle Discovery's ferry flight from Edwards Air Force Base in California. Discovery landed at Edwards Sept. 11 concluding its STS-128 mission to the International Space Station. The shuttle delivered more than 7 tons of supplies, science racks and equipment, as well as additional environmental hardware to sustain six crew members on the International Space Station. Photo credit: NASA/Mary Ann Chevalier