California

Crashed following an engine failure near Ludlow, California. All four crew members were killed.
Crew:
Sgt Layman L. Cash,
2nd Lt Renato Casini,
1st Lt Robert E. Johnson,
Cpl Sidney R. Vaughn.

The crew was performing night landing practice in the San Francisco Bay, off Alameda NAS. It is believed the crew lost control of the aircraft while avoiding collision with an aircraft carrier and crashed. Four crew members were killed.

In the evening, the crew left McClellan AFB, near Sacramento, on a routine flight to Seattle, Washington. After take off, the pilot completed a circuit over the airport to reach the assigned altitude of 16,500 feet and reduced the engine power to 2,300 RPM. After few minutes, the right engine failed, followed shortly later by the left engine. A crew member was able to bail out before the aircraft went out of control, dove into the ground and crashed in a huge explosion. All five occupants were killed while the sixth was found alive.
Crew:
Cpt Marvin E. Bradley,
Cpl Robert E. Delmar,
2nd Lt Christopher P. Gadsden Jr.,
2nd Lt Joe F. Welch.

A few minutes before 2200LT, the aircraft left Blythe Airfield and set an altitude for 15,000 feet and a heading towards Muroc for a night training bombing mission. No radio contact was made with the crew of the Liberator after take-off. At 2206LT, approximately 50 miles west of Blythe and north of Indio, the B-24 crashed and burned on a mountainside. All ten crew members were killed and the aircraft was totally destroyed.
Crew (34th BG):
2nd Lt Harold Schonberg, pilot,
2nd Lt Gene Healy, copilot,
2nd Lt Arnold Johnston, navigator,
2nd Lt Harry Louis, bombardier,
Sgt Ernest Simard, flight engineer,
Sgt Arnold Wilensky, radio operator,
Sgt Melvin Steeley, flight engineer,
Sgt Ross Hill, radio operator,
Sgt Paul Trusley, air gunner,
Sgt John Sweeney, air gunner.
Source: http://www.aircraftarchaeology.com/indiob24.html

The crew left Hamilton AFB in the morning on a routine training sortie. En route, the pilot informed ground about his position and a little later, the aircraft hit tree tops and crashed on a hilly terrain located ten miles northeast of Covelo. All six crew members were killed.
Photos on http://www.aviationarchaeology.com/b17tday.htm

En route, the twin engine aircraft hit a mountain located 4 miles east of Oakland, killing all nine crew members.

Shortly after take off from North Island-Halsey Field NAS, while climbing, the seaplane stalled and crashed in flames. Five crew members were killed while six others were injured.

While landing in the San Francisco Bay, the seaplane hit a submerged object and sunk. Three crew members were killed while three others were injured.

At the end of the night, while overflying the Pacific ocean off the Californian coast, the radio navigator contacted San Francisco ATC to inform about an estimated time of arrival at 0710LT, nearly three hours ahead the schedule. While approaching San Francisco from the north, by night and in poor weather conditions, at an altitude of 2,500 feet, the seaplane christened 'Philippine Clipper' hit the slope of a mountain located 7 miles southwest of Ukiah. Extensive emergency resources were dispatched to the scene where no survivors were found among the 19 occupants.
Crew:
Robert M. Elzcy, pilot,
G. F. Acbel, pilot,
Orven K. Judd, copilot,
L. A. Mackota, flight engineer,
J. J. Egan, flight engineer,
John Maynard, navigator,
C. P. Thompson, radio operator,
G. W. Angus, radio operator,
John Hill, steward.

The crew was conducting a training exercise on behalf of the USAAF. While flying in the vicinity of the Oakland Municipal Airport, the aircraft caught fire for unknown reason. The crew attempted to make an emergency landing but the aircraft crashed in flames and was destroyed by fire. Both occupants were injured.