Lame. That oft-repeated statement about herds of blown-up 727s but never a 904 is a pathetically ridiculous statement. The perveyers of this nonsense always FAIL to mention that, while the 727 came in both sb and bb configurations, the 904 NEVER DID. Put a bunch of 904s behind some BBs (You can't cuz they won't bolt up!) and watch how quick they turn to scrap metal.
