Investigators examining the black box data from a fatal midair collision between an American Airlines CRJ-700 jet and a U.S. Army Black Hawk near Washington, D.C., have found a critical altitude discrepancy. The jet’s black box shows it was flying at 325 feet, while air traffic control recorded the helicopter at 200 feet, a 125-foot difference that could offer key insights into the crash, which killed 67 people. The National Transportation Safety Board (NTSB) is exploring possible inaccuracies in the altitude reports, whether the helicopter exceeded its 200-foot limit, and the impact of night-vision goggles on the crew. Investigators are also reviewing evasive maneuvers and communication logs. The helicopter’s black box is still being examined after being delayed by water damage.