The astronauts for NASA's next-to-last space shuttle flight returned to Florida on Thursday for another try at launching to the International Space Station.


The six crewmen -- led by the husband of Rep. Gabrielle Giffords -- arrived at Kennedy Space Center a day before the countdown clocks begin ticking again.

Shuttle Endeavour is due to blast off Monday morning. The first launch attempt on April 29 was halted by electrical trouble. A switch box was replaced, and new wiring installed.

In brief remarks after the crew's arrival, commander Mark Kelly said the launch director has assured him that Endeavour is "in great condition."

Aboard Endeavour is a $2 billion particle physics detector that will be attached to the space station. The 16-day flight also will feature the delivery of station spare parts, as well as four spacewalks that will be the last for the 30-year shuttle program. Atlantis closes out the shuttle era with a flight in July.