China Airlines Flight 611 was a regularly scheduled international passenger flight from Chiang Kai-shek International Airport in Taiwan to Hong Kong International Airport that disintegrated midair and crashed into the Taiwan Strait, 23 nautical miles northeast of the Penghu Islands, 20 minutes after takeoff, killing all 225 people on board. The in-flight breakup was caused by metal fatigue cracks from a tail strike at Kai Tak Airport on 7 of February 1980 in which the aircraft was not properly repaired according to Boeing policies and manuals. Metal fatigue from over 22 years of service and repeated depressurizations caused tiny cracks that led to the aircraft's breakup.