California

While flying at an altitude of 7,200 feet, the twin engine aircraft lost a part of its right wing and the empennage failed as well. Out of control, the aircraft dove into the ground, partially disintegrated in the air and eventually crashed on the slope of a mountain located in the Donner State Park, west of Hobart Mills. All 26 occupants were killed.
Crew:
Cpt Richard K. Young, pilot,
1st Lt Louis N. Duesing, copilot,
Sgt Antone J. Esgro, flight engineer.
Passengers:
Lyle C. Dykes,
Richard O. Ehlers,
Cpt Donald A. Bride,
Raymond L. Schneider,
Lt L. S. Stark,
Floyd R. Sundgren,
Lt Col Clyde M. Taylor,
1st Lt Ervin P. Cue,
Maurice L. Bose,
Charles R. Branass,
Pvt Glenn P. Dickerson,
Cpl William T. Woodhouse,
Pasqual Iuluicci,
Melvin S. Van Riper,
Lt Frank W. Davis,
Ens Gino C. Caletti,
Stephen R. Kirsch,
Gerald P. Udell,
Robet A. McGee,
Lt John C. Shaw,
1st Lt James E. Milton,
2nd Lt Richard F. Simpson,
Pvt Willie B. Wilson.

At 0559LT, the aircraft departed Tucson and routine position reports were subsequently received from the flight over Casa Grande, Gila Bend, and Yuma, Arizona. At 0754, the American Airlines radio operator at San Diego transmitted the 0750 weather report for San Diego: Indefinite ceiling 1,200 feet, broken clouds; visibility 8 miles. Receipt of this information was acknowledged by flight 6103 and immediately thereafter the flight reported that it had been over El Centro, California, at 0753 at 3,000 feet. Los angels Airway Traffic Control delivered a clearance for Flight 6103 to American Airlines radio station at San Diego clearing the flight to San Diego to cruise at 8,000 feet and to cross San Diego at an altitude of at least 500 feet above the overcast. The company station, in turn, attempted to relay the Airway Traffic Control clearance to the flight at 0812, however, after several attempts at establishing contact with the flight, Airway Traffic Control was advised that the clearance as not delivered. All further attempts to contact the flight were unsuccessful. Routine search procedures were initiated immediately and at 1305 aircraft of the Naval Air Control Center at San Diego reported sighting the wreckage of the airplane was spotted on the east slope of Thing Mountain, some 10 miles southeast of Pine Valley. The aircraft was destroyed by impact forces and all 25 occupants were killed.

Following several modifications, the aircraft was completing a test flight for a CAA certification and was carrying a NAA research engineer, one pilot and a CAA inspector. After its departure from Los Angeles-Mine Field, the twin engine aircraft flew to the northwest when an engine caught fire in flight. Out of control, the aircraft dove into the sea and crashed few miles off Malibu. All three occupants were killed.
Crew:
Joseph E. Barton, pilot,
Albon C. Cowles Jr., research engineer.
Passenger:
Mr. McCutcheon, CAA inspector.
Source: http://www.joebaugher.com/usaf_bombers/b25_20.html

The aircraft departed Palm Springs in VFR conditions but while approaching the Sacramento area, the crew should continue in IFR mode. While descending to McClellan AFB, pilots were unable to locate the airport and were unaware of their exact position when the aircraft hit tree tops and crashed on a wooded mountain located three miles northwest of Auburn, about 20 miles northeast of the McClellan AFB. All three crew members and six passengers were killed while 16 other occupants were injured.

Few minutes after takeoff from Norton AFB, in San Bernardino, while cruising in poor weather conditions, the aircraft hit the west slope of Mt Baldy at a height of 10,064 feet. The wreckage was found a day later and all four occupants have been killed. At the time of the accident, visibility was poor due to low clouds and precipitations.

While performing a night training mission off San Diego, the pilot lost control of the aircraft that dove into the sea and sank. There were no survivors.

The crew was performing a test flight while flying at low height, the seaplane (ski equipped) hit power cables and crashed into the Mission Gorge near the Mission Dam. Both pilots were killed.
Crew:
Cpt G. D. Ferrin,
Acmc F. S. Rakovic.

The crew departed Reno on a high level training flight bound for Long Beach, California. Enroute, weather conditions worsened and the captain decided to return to Reno. Few minutes later, the aircraft went out of control, dove into the ground and crashed in the American River Canyon located in Gold Run. The aircraft was destroyed and all three crew members were killed. There are conflicting versions about the reason of occurrence as one revealed that the loss of control was caused by an explosion in the right wing and the separation of both wings shortly later, and the second version mentioned a fire in the cockpit.

Shortly after midnight, while cruising in low visibility, the twin engine aircraft hit a ridge and crashed in a canyon located 3,5 miles southwest of Cordelia. All three crew members were killed.
Crew:
Pvt Harry S. Cooper,
1st Lt Glen K. Dorsey,
1st Lt Francis E. Reagan.

Shortly after takeoff from San Francisco, while climbing, the seaplane hit a mountain slope and crashed. Two crew members were seriously injured while seven others were killed.