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The federal investigation of the deadly midair collision of two World War Two planes in Dallas over the weekend could take up to 18-months. Six people were killed when a Bell P-63 King Cobra crashed into a B-17 during the Wings Over Dallas Air Show on Saturday before thousands of spectators. The National Transportation Safety Board says GPS from the P-63 and an electronic flight display from the B-17 have been recovered, but both are damaged. The NTSB says it plans to release its preliminary findings in four to six weeks.