07-07-2015, 02:29 PM
Given that something melted thousands of steel file cabinets in those offices, so that only one was (partially) recognizable and recovered, and that fires kept burning for many weeks in the pit, it wouldn't be surprising that the flight recorders (if there were any) were consumed too. Some kind of high-tech explosives were used to bring down those buildings, which explains a lot of things that were otherwise impossible that day.