By Alexandra Skores, Aaron Cooper, CNN

Washington, DC (CNN) — In more than 32 hours of testimony across three days the National Transportation Safety Board probed virtually every detail of what led up to the January 29 midair collision between a US Army Black Hawk helicopter and an American Airlines regional jet, operated by PSA airlines.

The focus Friday evening was the many organizational structures that may have impacted the deadly collision, which killed 67 people over the Potomac River, near Ronald Reagan Washington National Airport.

“I don’t think the accident occurred that night. I think it happened years before,” Clark Allen, Air Traffic Control Specialist at the Federal Aviation Administration said. “It was a combination of many years that built up to that evening.”

Managemen

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