Authorities said they found no devices Thursday on a United Airlines plane after a bomb threat was called into Denver International Airport. No passengers were on the plane when the airport received the threatening call about flight 869 at 7:30 a.m. MST, The Denver Post reported. The passengers originally scheduled for the flight were put on a different one, which left for San Francisco at 9:33 a.m. \"We don\'t take chances when it comes to passengers lives, so we check things thoroughly,\" said Dave Joly, a spokesman for the FBI. The plane was fully searched and no bombs were found in bags or cargo, the Post said. Airport operations have returned to normal.