The piece was found by construction surveyors. So people actually inspecting the area, not just Joe Blow walking by. Hence why it went so long unnoticed, because its not in a place you would notice just walking by.
We have a family friend that is a NYPD police officer that was there that day. The conspiracy that it was a demolition, etc. is a load of cr*p.
When those buildings fell they left catastrophic damage to buildings around them in Lower Manhattan. The Twin Towers were not the only buildings that were destroyed. How you can watch the videos of the towers falling and not understand that debris went everywhere is beyond me.
I find it mostly ironic that the piece of plane was found near the site of a mosque.