That link to the downing of AAL587 is a joke. There are too many errors and falsehoods to count. (But don’t tell that to conspiracy theorists; they won’t listen.)
I don’t have time (or care enough) to refute each one of them, but I will shed some light on one part that I’m more or less an expert on: Having read quite a few NTSB reports about quite a few aviation accidents, I know that eyewitnesses to aviation accidents are extremely unreliable. Even eyewitnesses who are pilots routinely give differing accounts of the same accident. And people with no knowledge of aviation usually see (or hear) things that just aren’t there and miss rather obvious things that are. These errors occur whether a Cessna 150 buys a farm in Podunk, Canada or an Airbus falls out of the sky over New York City. And I’m pretty sure terrorists aren’t targeting Cessnas in Saskatchewan.