High Quality Content by WIKIPEDIA articles! Hughes Airwest Flight 706 was a regularly scheduled Hughes Airwest flight operated by a Douglas DC-9-31 that collided in midair with a U.S. Marine Corps F-4B Phantom II on June 6, 1971. Flight 706 was en route from Los Angeles, California, to Seattle, Washington, with stopovers in Salt Lake City, Utah; Boise, Idaho; Lewiston, Idaho; Pasco, Washington; and Yakima, Washington. The F-4B Phantom was flying from Naval Air Station Fallon, Reno, Nevada, to Marine Corps Air Station El Toro, Irvine, California. All 49 passengers and crew aboard the civilian airliner, as well as the F-4B pilot, died in the collision over the San Gabriel Mountains, near Duarte, California.