On January 9, 2011, Iran Air Flight 277, a Boeing 727 on a scheduled domestic service from Tehran to Urmia, Iran, crashed after aborting its approach into Urmia Airport in poor weather. Seventy-eight of the 105 people on board were killed. The official investigation concluded that icing conditions and incorrect engine management by the crew led to a double engine flame-out, loss of altitude and impact with the ground.