Delta B744 near Webequie on May 12th 2014, air conditioning problems

A Delta Airlines Boeing 747-400, registration N662US performing flight DL-159 from Detroit,MI (USA) to Seoul (South Korea), was enroute at FL300 about 30nm eastsoutheast of Webequie,ON (Canada) when the crew decided to return to Detroit due to air conditioning problems. The aircraft maintained FL300 on the way back and landed safely back in Detroit about 90 minutes later.

The flight was cancelled.