Date: June 06, 1971
Time: 1711
Location: Near Duarte, California
Operator: Hughes Airwest / Military - US Marine Air Corps
Flight #: 706
Route: Los Angeles - Salt Lake City
AC Type: McDonnell Douglas DC-9-31 / F4-B
Registration: N9345/151458
cn / ln: 47441/503 / ?
Aboard: 51   (passengers:44  crew:7)
Fatalities: 50   (passengers:44  crew:6)
Ground: 0
Summary: The DC-9 was climbing to FL 330 under radar control of the LA ARTCC and the F4-B was en route to El Toro under VFR. Visibility was good with no clouds. The collision took place at 15,150 feet. Both planes crashed into the San Gabriel Mountains. One of two killed on the F4 when the forward canopy did not jettison. The other crew member parachuted to safety unhurt. All forty-nine killed aboard the DC-9. Failure of both crews to see and avoid each other and failure of the F4 crew to request radar advisory service and particularly considering the fact that they had an inoperable transponder. Allegations also surfaced that the F-4B was performing an aerobatics maneuver shortly before the collision.

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