https://www.yale64.org/news/shea.pdf

There was a 4-part series, here are all the parts I think: https://www.youtube.com/watch?v=euoHYWD5C_U

Direct quote around 4:30 but it's all interesting.

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Actually, I will add a few more mainstream sources (no conspiracies, only official published results from the official commissions and mainstream news) with head-scratchers about what happened on 9/11...

1) Leading up to the attacks, the CIA at the time specifically acted to block some people in the FBI from sending cables that would have alerted the FBI to the presence of the terrorists in the country:

https://en.wikipedia.org/wiki/9/11_Commission#CIA_withheld_i...

2) The 9/11 Commission found that ""At some level of the government, at some point in time, a decision was made not to tell the truth about the national response to the attacks on the morning of 9/11 ... The [NORAD] tapes told a radically different story from what had been told to us and the public."[19] Thomas Kean, the head of the 9/11 Commission, concurred, saying, "We to this day don't know why NORAD told us what they told us, it was just so far from the truth."[20]"

https://en.wikipedia.org/wiki/9/11_Commission#NORAD_falsehoo...

3) On the day, NORAD was inexplicably ineffective at scrambling jets to intercept the hijacked aircraft, leading passengers of the fourth one to take matters into their own hands. Efforts to find out why this happened, even at the highest levels, have been frustrated. This is similar to the numerous questions about what happened with Israeli Defense Forces on October 7th and why it took them so long to come, when their own spotters whose only job it was to watch for these attacks, were calling in the attack for multiple hours before they were overrun and murdered... and the explanations are just as head-scratching: https://www.timesofisrael.com/surveillance-soldiers-say-oct-...

4) CNN Video soon after 9/11: Hijacker's passport found blocks from the World Trade Center crash site, completely intact, and given to a police officer by an unidentified man who "ran away": https://www.youtube.com/watch?v=V-QycTzwV7c

5) CBS Morning "Exclusive": Videos from 2000 surfaced of two 9/11 hijackers being seen at parties hosted by people on the payroll of Saudi intelligence... declassified in 2017: https://www.youtube.com/watch?v=q2UahouPSiA

6) Vanity Fair: just days after 9/11, members of the Bin Laden family were whisked out of the US on private jets: https://www.vanityfair.com/news/2003/10/saving-the-saudis-20...

7) Declassified documents (still heavily redacted) about the 9/11 materials released in response to Biden's executive order: https://vault.fbi.gov/9-11-attacks-investigation-and-related...