Japan Airlines Flight 123 was a Japan Airlines domestic flight from Tokyo International Airport (Haneda) to Osaka International Airport (Itami). On Monday, August 12, 1985, the Boeing 747-146SR that made this route, registered JA8119, suffered mechanical failures 12 minutes into the flight and 32 minutes later crashed into two ridges of Mount Takamagahara in Ueno, Gunma Prefecture, 100 kilometers (62 mi) from Tokyo. The crash site was on Osutaka Ridge (御巣鷹の尾根), near Mount Osutaka. All 15 crew members and 505 out of 509 passengers died, resulting in a total of 520 deaths and four survivors. It is the deadliest single-aircraft accident in history, and the second-deadliest accidental plane crash in history behind the Tenerife airport disaster.