CAPE CANAVERAL, Fla. – At a media conference following the day-long Flight Readiness Review of space shuttle Discovery for the STS-119 mission, NASA managers respond to questions. From left are John Shannon, Shuttle Program manager, Mike Suffredini, program manager for the International Space Station, and Mike Leinbach, shuttle launch director. 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

CAPE CANAVERAL, Fla. – At a media conference following the day-long Flight Readiness Review of space shuttle Discovery for the STS-119 mission, NASA's Space Shuttle Program Manager John Shannon responds to a question. On the right is Mike Suffredini, program manager for the International Space Station. 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

CAPE CANAVERAL, Fla. – 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

CAPE CANAVERAL, Fla. – At a media conference following the day-long Flight Readiness Review of space shuttle Discovery for the STS-119 mission, NASA's Associate Administrator for Space Operations William H. Gerstenmaier (left) responds to a question. At right are NASA's Space Shuttle Program Manager John Shannon and Program Manager for the International Space Station Mike Suffredini. 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

CAPE CANAVERAL, Fla. – Mike Curie (left), with NASA Public Affairs, introduces NASA managers following their day-long Flight Readiness Review of space shuttle Discovery for the STS-119 mission. Next to Curie are (from left) William H. Gerstenmaier, associate administrator for Space Operations, John Shannon, Shuttle Program manager, Mike Suffredini, program manager for the International Space Station, and Mike Leinbach, shuttle launch director. 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