From PBS NewsHour.

Federal investigators say that last year’s crash between an American Airlines jet and a U.S. Army helicopter over Washington, D.C., was "100 percent preventable."

At the Tuesday hearing, NTSB officials said air traffic controllers were routinely overwhelmed and had grown accustomed to close calls. They also said the jet’s pilot was not alerted about the helicopter and that the airspace over the nation’s capital was crowded that night.

NTSB Chairwoman Jennifer Homendy expressed frustration that years of warnings to reroute helicopter traffic were ignored.

Just last week, the FAA placed further limitations on planes and helicopters sharing airspace near Reagan National Airport. All 67 people on board both aircraft died in last year’s crash.

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