Japan Airlines Flight 123 was a scheduled domestic flight from Tokyo's Haneda Airport (also known as Tokyo International Airport) to Osaka International Airport (Also known as Osaka Itami Airport). On August 12, 1985, the Boeing 747-146SR developed mechanical problems 12 minutes after taking off. The plane then crashed into Mount Takamagahara in Gunma Prefecture 32 minutes later, after the pilots tried to control the plane, but failed. 520 people died, and only 4 survived. The crash was caused by incorrect repair after a tailstrike incident, which caused metal fatigue and eventually an in-flight structural failure, in which the whole tail of the plane separated from the plane.