The January midair collision of an Army helicopter with a flight from Wichita, which killed 67 people, is the topic of a three-day investigative hearing by the National Transportation Safety Board.

WASHINGTON — It has been six months since an American Airlines regional jet and a U.S. Army Black Hawk helicopter collided in midair near Washington, D.C., killing all 67 people on board both aircraft.

The crash has been under investigation by the National Transportation Safety Board, which is set to begin a three-day investigative hearing this week to share new information on the deadliest U.S. aviation accident in decades.

The January air disaster renewed concerns about U.S. aviation safety and raised questions about the crowded airspace around the nation's capital, which is s

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