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https://live-production.wcms.abc-cdn.net.au/c08668959e612508e0d274c58175f8b6?impolicy=wcms_watermark_news&cropH=2067&cropW=3675&xPos=0&yPos=383&width=862&height=485&imformat=genericPreliminary data about the aircraft collision over Washington DC shows conflicting readings about the altitudes of the passenger plane and army helicopter.