1978 San Diego mid air collision, a Cessna 172 Skyhawk N7711G and a PSA 727-214 N533PS collided over San Diego on September 25 1978 killing over 135 passengers on the 727 and 2 on the Cessna, 7 were killed on ground making it 144 deaths. and injuring 9 on ground. 727 crashed at 9:02:04.5 PST