The Brazilian Air Force panel investigating the horrific Sept. 29, 2006, mid-air collision that killed 154 in the Amazon has concluded that the American pilots could not have accidentally turned off the transponder in the business jet that survived the crash. And nobody who isn't certifiably crazy thinks they did so deliberately.
(Update, Nov. 30 -- Down the rabbit hole again: A Brazilian federal judge says the pilots have to return to Brazil for trial. Case closed! Call the witnesses! See my Brazil blog. )