New details are emerging about the deadly collision between an American Airlines flight and an Army helicopter in January near Reagan Washington National Airport, which killed 67 people.

Three days of National Transportation Safety Board (NTSB) hearings, along with thousands of pages of documents, suggest that the Black Hawk helicopter may have been relying on misleading instrument readings when it was operating too high over the Potomac River in the lead-up to the midair collision.

The crash, alongside nonfatal but significant disruptions at other U.S. airports, brought national attention to longstanding strains on the air traffic control workforce.

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