The Falcon 9 SpaceX rocket stands on space launch complex 40 ready for another launch attempt at the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Monday, May 21, 2012. After an aborted attempt with a half-second remaining before liftoff last
The Falcon 9 SpaceX rocket stands on space launch complex 40 ready for another launch attempt at the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Monday, May 21, 2012. After an aborted attempt with a half-second remaining before liftoff last Saturday, SpaceX is set to launch early on Tuesday, May 22. John Raoux, Associated Press
By Associated Press

CAPE CANAVERAL, Fla. — This time, private rocket maker SpaceX is hoping for an actual liftoff for its history-making flight to the International Space Station.

The company's Falcon 9 rocket is poised on its launch pad at Cape Canaveral, Fla. Liftoff is scheduled for 3:44 a.m.

Aboard the rocket is a SpaceX Dragon capsule filled with space station supplies. No private business has attempted to launch a vessel to the space station — until now. It's part of NASA's post-shuttle strategy.

On Saturday, the rocket's engines fired but shut down with just a half-second remaining in the countdown. A bad valve was replaced.

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Forecasters say the weather looks good. The California-based company has just one second to get its rocket flying.

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