Japan Airlines Flight 123 was a Japan Airlines

Japan Airlines

is an airline headquartered in Shinagawa, Tokyo, Japan. It is the flag carrier of Japan and its main hubs are Tokyo's Narita International Airport and Tokyo International Airport , as well as Nagoya's Chūbu Centrair International Airport and Osaka's Kansai International Airport...

 domestic flight from Tokyo International Airport

Tokyo International Airport

, commonly known as , is one of the two primary airports that serve the Greater Tokyo Area in Japan. It is located in Ōta, Tokyo, south of Tokyo Station....

 (Haneda) to Osaka International Airport

Osaka International Airport

or Osaka-Itami International Airport is the primary domestic airport for the Kansai region of Japan, including the major cities of Osaka, Kyoto, and Kobe. It is classified as a first class airport....

 (Itami) on August 12, 1985. The Boeing 747-146SR

Boeing 747

The Boeing 747 is a wide-body commercial airliner and cargo transport, often referred to by its original nickname, Jumbo Jet, or Queen of the Skies. It is among the world's most recognizable aircraft, and was the first wide-body ever produced...

 that made this route, registered , suffered mechanical failures 12 minutes into the flight and 32 minutes later crashed into two ridges of Mount Takamagahara

Mount Takamagahara

Mount Takamagahara is a mountain in the Gunma Prefecture of Japan, near Ueno village. Its measurement is tall.The crash of Japan Airlines Flight 123 was initially reported on Mount Osutaka, but later confirmed to be on the ridge of Mount Takamagahara at a height of approximately above sea level...

 in Ueno

Ueno, Gunma

is a village located in Tano District, Gunma, Japan.As of 2003, the village had an estimated population of 2,152 and a density of 11.83 persons per km²...

, Gunma Prefecture

Gunma Prefecture

is a prefecture of Japan located in the northwest corner of the Kantō region on Honshu island. Its capital is Maebashi.- History :The remains of a Paleolithic man were found at Iwajuku, Gunma Prefecture, in the early 20th century and there is a public museum there.Japan was without horses until...

, 100 kilometres (62.1 mi) from Tokyo. The crash site was on , near Mount Osutaka

Mount Osutaka

is a mountain in Ueno, Gunma Prefecture, Japan. It is tall.The plane crash of JAL 123 was initially reported on Mount Osutaka, but later confirmed to be on a ridge near Mount Takamagahara. It was the deadliest single plane accident in world history....

. All 15 crew members and 505 out of 509 passengers died, resulting in a total of 520 deaths and four survivors.

It is currently the deadliest single-aircraft accident in history, and the second deadliest plane crash in history behind the Tenerife airport disaster.
The aircraft involved, registration number JA8119, was a Boeing 747-100SR.