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The top piece of the 408-foot spire for One World Trade Center is shown at ground level, Wednesday, May 1, 2013 in New York. The piece will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey, (AP Photo/Mark Lennihan)

Associated Press
The top piece of the 408-foot spire for One World Trade Center is shown at ground level, Wednesday, May 1, 2013 in New York. The piece will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey, (AP Photo/Mark Lennihan)
The top piece of the 408-foot spire for One World Trade Center is shown at ground level, Wednesday, May 1, 2013 in New York. The piece will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey, (AP Photo/Mark Lennihan)
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