While the website is a bit…interesting, this article is chilling:
In the run-up to the 2000 Olympic Games in Sydney, there was active consideration of the danger of â€œa fully loaded, fuelled airliner crashing into the opening ceremony before a worldwide television audience,â€? according to former Sydney police superintendent Paul McKinnon. Osama bin Laden was considered the number one threat, he said. IOC officials said plane-crash catastrophes have been incorporated into security planning for every Olympics since 1972.
And the people helping them plan for and prevent these attacks? The FBI of course. Here’s the article.