(AP) -- Thunderstorms are still threatening to delay NASA's last space shuttle launch, set for Friday.
On the eve of the historic liftoff, a senior manager said Thursday that NASA will try for an on-time launch of Atlantis anyway. That's despite a 70 percent chance bad weather would stop the liftoff.
Launch time is 11:26 a.m.
Atlantis and four astronauts will carry a load of supplies to the International Space Station. Also on board are hundreds of crew patches and pins, as well as thousands of shuttle bookmarks for kids, to commemorate the 30-year program.
At least 750,000 people are expected to jam Cape Canaveral and surrounding towns for the launch. Dozens of astronauts already are in town, including the very first shuttle pilot Robert Crippen. He flew Columbia in 1981.
Explore further: Image: Striking lightning from space