The National Transportation Safety Board questioned witnesses Thursday about air traffic control training, a key part of the investigation into January’s deadly midair collision at Ronald Reagan Washington National Airport. It was the second of three days of investigative hearings into what happened in the accident that killed 67 people.

That night, the air traffic control tower warned the US Army Black Hawk helicopter about the approaching American Airlines regional jet, operated by PSA Airlines, but didn’t tell the passenger plane’s pilots, an Federal Aviation Administration official confirmed in the hearing.

Standard procedures, NTSB Chairwoman Jennifer Homendy noted, require controllers to warn pilots about nearby traffic.

“Were any traffic advisories or safety alerts issued?” she a

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