Hughes Airwest Flight 706

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.

The collision was the first fatal crash of a commercial airliner in the United States since the September 9, 1969, collision of Allegheny Airlines Flight 853 with a Piper PA-28. The crash of Flight 706 prompted the US Armed Forces to agree both to cut down the number of military aircraft operating under visual flight rules in civilian air corridors, and to require military aircraft to obey civilian air traffic controllers.