This is a section of belly skin, probably from the center wing section. The octagonal patch at center right is what caught my attention. It looks to me like an antenna had been removed and the cutout patched. I wonder if that's where one of the radio altimeter antennas had been located... The airplane delivered originally to American Airlines with a rad-alt system installed, but had been removed at the time of the crash. I sometimes wonder if a rad-alt had been available, and the pilots had utilized it, the crash might had been averted if the crew had realized just how close to terrain they were. About 30 seconds prior to impact, they had missed another ridge by only around 300 feet.