Forecasters said the odds of good weather for Monday's scheduled liftoff of Endeavor are at 70 percent- the main concerns are stiff crosswind and low clouds. The launch that was scheduled last month was scrubbed because of an electrical problem.
Commander /*Mark Kelly*/ and his five crewmates returned to Kennedy Space Center on Thursday. Their families will follow this weekend, including Kelly's wife, Arizona Rep. /*Gabrielle Giffords*/, who was critically wounded in January at a political event in Tucson.
A crowd of 500,000 is anticipated for Monday's launch. This will be the 25th and final journey for Endeavour. Four spacewalks are planned during the 16-day mission.
Only one other shuttle flight remains, by Atlantis in July.
The Associated Press contributed to this story