US airlines had gone 16 years without a fatal crash until Wednesday night. But as impressive as that safety record had been, there have been warning signs in recent years of a significant risk of a collision like the one that just killed 67 people.
A regional jet from Wichita, Kansas, operated as an American Airlines flight by feeder carrier PSA Airlines, was preparing to land at Ronald Reagan Washington National Airport when it collided with a US Army Black Hawk helicopter that was crossing its path just a few hundred feet above
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