31 August 2013
United flight UA-869 , Boeing 747-400 from San Francisco to Hong Kong took off from San Francisco and it was en route for around 1 hour when one cockpit windshield cracked.The crew advised the tower and after dump some fuel diverted back to San Francisco airport for a safe landing
San Francisco airport
Source
http://flightaware.com/live/flight/UAL869/history/20130831/2000Z/KSFO/VHHH