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The request to switch runways: Air-traffic control asked flight 5342 to land at a different, shorter runway before the crash, changing the aircraft's flight path to cross with the H-60 helicopter’s.

The Federal Aviation Administration issued a statement saying that A PSA Airlines Bombardier CRJ700 regional jet collided in midair with a Sikorsky H-60 helicopter while approaching Washington ...

"A PSA Airlines Bombardier CRJ700 regional jet collided in midair with a Sikorsky H-60 helicopter while on approach to Runway 33 at Reagan Washington National Airport around 9 p.m. local time.

The jet, which was operated by an American Airlines' subsidiary PSA Airlines, reportedly collided with a Sikorsky H-60 helicopter, a US army helicopter which had been on flight training.