FWIW IMHO it's worth allowing this thread, since anyone who has read the book has a chance to air their views (good or bad) and perhaps have then addressed by the author (or at least someone purporting to be the author).
Personally, I am interested in air crash investigations (I read reports as a bit of a hobby and soaked up Macarthur Job's books) and so had planned to read Prof Bibel's work; the first post in this thread, Tristar 500, has no so much acted as an advertisement as far as I'm concerned, but simply alerted me to its wider availability than I thought and opened a discussion as to the book's technical accuracy.
So I, for one, would ask that this thread be left open. If you don't happen to like it, then don't click on the link to it and you're always free to cancel the 'subscription' which sends you emails each time there's a new post.