As the US search for Steve Fossett enters its tenth day, experts say they doubt the millionaire adventurer could have survived more than a week in the rugged desert after his plane vanished.

As the search for missing aviator Steve Fossett enters its sixth full day concern is growing as the unprecedented effort drags on with no clue about his possible location.

Fears were growing today for the safety of adventurer Steve Fossett who was flying across a rugged mountainous area in Nevada notorious for treacherous winds when he disappeared three days ago.

A search for missing world aviation record holder Steve Fossett resumed today over hundreds of square miles of rugged terrain.

Richard Branson has backed missing adventurer Steve Fossett to return safe and well.