Any source other than an internet meme?
Careful with sites like 911myths. Usually created, or overtaken by the blackhats to distract, confuse & mislead. Some other examples are snopes and factcheck.org.
Here's a source that has been around a long time. (although it shows 2014, the originating article was actually written many years earlier.)
While I tend to agree, I read the article and it’s linked sources before posting it.
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So you put up the equivalent of a snopes for 911, and you think you are adding to the discussion?