As Pacific Air Lines Flight 773 made its final approach to SFO, all seemed well. May 7, 1964, had dawned cloudy, but as the two pilots navigated the short flight from Stockton, they’d had no trouble. Behind them, 41 passengers and a flight attendant prepared for landing. At 6:47 a.m., as the plane glided toward San Ramon, an air traffic controller made contact to let them know their transmission wasn’t coming through clearly. A moment later, what sounded like a scream ripped through the airwaves. “Skipper’s shot,” someone was shouting. “We’ve been shot.” The air traffic controller asked the pilot...