spaceflightnow.com earlier:
1400 GMT (10:00 a.m. EDT)
The shuttle Atlantis is poised for blastoff Sunday on a long-awaited flight to restart assembly of the international space station three years after the Columbia disaster derailed construction. Atlantis and its six-person crew will deliver a $372 million set of solar arrays to the outpost, kicking off the most ambitious series of manned space flights since the Apollo moon program.