It’s been about a month since I’ve heard anything about the black boxes from the 4 planes. CNN doesn’t seem to have any info about them. Have they all been recovered? Did they provide any new evidence/info?
They only recovered black boxes from two planes–the Pentagon and Pennsylvania planes, and the little data they were able to get hasn’t been very helpful. The Pentagon flight recorder was too damaged, and the Pennsylvania tape just has scuffling and shouts in Arabic and English.
Considering the forces (several hundreds or thousands of tons) involved, I’d say it’s more than extremely unlikely that any flight data recorders will be recovered from the WTC site. The black boxes are tested only to 5000 PSI. If they had been ejected from the planes/buildings during the crash they would have been recovered by now.