Date: April 21, 1929
Time: 1145
Location: San Diego, California
Operator: Maddux Airlines / Military - U.S.Army Air Force
Flight #: ?
Route: San Diego - Phoenix
AC Type: Ford 5-AT-B Tri-Motor / B-PW-9D
Registration: NC9636 / 28-037
cn / ln: 4-AT-010
Aboard: 6   (passengers:3  crew:3)
Fatalities: 6   (passengers:3  crew:3)
Ground: 0
Summary: A midair collision occurred with a US Air Force Boeing PW-9D at 2,000 ft. Five killed on the Tri-motor, one on the Boeing. Army pilot Lieutenant Howard Keefer, while flying above the airliner, was stunting and performed a steep banking turn downward, in an attempt to pass in front of the airliner. Instead, he misjudged the speed of the Maddux aircraft and his diving plane struck the cockpit of the Ford Tri-motor. He was found criminally negligent.

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