STS-119 Pilot Tony Antonelli smiles after the successful practice landings in the shuttle training aircraft.

On the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-119 Pilot Tony Antonelli smiles after the successful practice landings in the shuttle training aircraft. STS-119 Commander Lee Archambault and Pilot Tony Antonelli practiced shuttle landings as part of the Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and a simulated launch countdown. The STA is a Grumman American Aviation-built Gulf Stream II jet that was modified to simulate a shuttle’s cockpit, motion and visual cues, and handling qualities. In flight, the aircraft duplicates the shuttle’s atmospheric descent trajectory from approximately 35,000 feet to landing. The crew of space shuttle Discovery is targeted to launch on the STS-119 mission Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Kim Shiflett