At a media conference following the day-long Flight Readiness Review of space shuttle Discovery for the STS-119 mission, Program Manager for the International Space Station Mike Suffredini (right) responds to a question. At left is NASA's Space Shuttle Program Manager John Shannon. NASA managers decided to plan a launch no earlier than Feb. 19, pending additional analysis and particle impact testing associated with a flow control valve in the shuttle's main engine system. Photo credit: NASA/Cory Huston