Pacific Airlines Flight 773 is hijacked by Francisco Gonzales and crashes in Contra Costa County, California, killing 44.

Pacific Air Lines Flight 773 was a Fairchild F27A Friendship airliner that crashed on May 7, 1964, near San Ramon, California, a suburb in the East Bay, east of Oakland. The crash was most likely the first instance in the United States of an airliner's pilots being shot by a passenger as part of a murder–suicide. Francisco Paula Gonzales, 27, shot both pilots before turning the gun on himself, causing the plane to crash, killing all 44 aboard.

Francisco Paula Gonzales was a Filipino sailor and mass murderer.

Contra Costa County is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States census, the population was 1,165,927. The county seat is Martinez. It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban. The county's name refers to its position on the other side of the bay from San Francisco. Contra Costa County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.

May 7 is the 127th day of the year in the Gregorian calendar; 238 days remain until the end of the year.