Usually, every September 11th, I post a link to an amazingly well done site that has researched pretty much everything about the attack and events leading up to it. Sadly, the site is gone and no longer updated, but it is archived at Archive.Org.

History Commons had a 9/11 timeline spanning from 1945 (when the Empire State Building was struck by a B-25) to 2018, each article referenced by a media link. It's an interesting (and reliable) read, with some surprising little known info, including a possible fifth plane that never made it into the air (United Flight 23).

Sad it hasn't been updated. It had some other timelines that could well serve us today.

web.archive.org/web/20211009005323/http://www.historycommons.org/project.jsp?project=911_project