"No Plane" Witness
Maria and her employees were stunned when they saw the horrible sight of the World Trade Tower building burning furiously -- thick, black smoke, billowing out of the first tower. Initially, everyone thought it simply a tragic airline accident, when without warning, the second tower exploded into flames. No one saw the second plane take deliberate aim for the tower, and it wasn't until later that news reports confirmed that the U.S. was under terrorist attack.
From the pictures at the site, it seems as though these people were in a close enough position to see or hear a plane.