was a scheduled domestic Japan Airlines passenger flight from Tokyo's Haneda Airport to Osaka International Airport, Japan. On Monday, August 12, 1985, a Boeing 747SR operating this route suffered explosive decompression 12 minutes into the flight and, 32 minutes later, crashed into two ridges of Mount Takamagahara in Ueno, Gunma Prefecture, from Tokyo. The crash site was on , near Mount Osutaka. All 15 crew members and 505 of the 509 passengers on board died. The death toll was exacerbated by delays in the rescue operation.