Now, for the first time since it happened, I learn that there was a helicopter looking to rescue people. Hat-tip to Adelaide Green Porridge Cafe: World Trade Centre New Aerial Photographs from after the attack
9/11 photos: helicopter pilot describes taking the pictures - Telegraph:
A series of dramatic aerial photographs have been published showing the devastation of the Sept 11, 2001 attacks on the World Trade Center.
As the photos show, the top of the building was so covered with smoke that it would havew been very difficult to rescue anyone who was up there, if they managed to getr up there.