Pan Am Flight 1104

62100,[1] was a Martin M-130 flying boat nicknamed the Philippine Clipper that crashed on the morning of January 21, 1943, in Northern California.

The aircraft was operated by Pan American Airways, and was carrying ten US Navy personnel from Pearl Harbor, Hawaii, to San Francisco, California.

The aircraft crashed in poor weather into mountainous terrain about 7 mi (11 km) southwest of Ukiah, California.

Rear Admiral English planned to visit submarine support facilities at the Mare Island Naval Shipyard bordering San Pablo Bay, and was accompanied by three of his senior staff officers.

Another passenger was Lieutenant Edna Morrow, a Navy nurse diagnosed with terminal cancer who was on her way home to die.

Heavy rain, strong winds, thick cloud cover, and fog forced the captain to descend to a lower altitude.

[2] Over a week passed before the wreckage was located, and after it was found, the area was cordoned off by soldiers to protect any surviving classified military documents that may have been carried aboard.

Memorial plaque located at the Hiller Aviation Museum