Flight teams are following up on leads but have found "nothing promising" in their fourth full day of hunting for billionaire adventurer Steve Fossett, a sheriff's official said Friday.
"Everyone here is hopeful," said Joe Sanford, undersheriff of Lyon County, Nevada, "but I've got to tell you that the family is subdued and they're having a tough time with this. Searchers so far have been frustrated.
"... Mr. Fossett is an accomplished pilot, and no one knows what happened or where he is," Sanford said at a news briefing. 
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