updated 9/18/2007 1:24:18 PM ET 2007-09-18T17:24:18

Rescue crews scaled back their search for millionaire adventurer Steve Fossett after two weeks with no sign of his missing plane in Nevada's rugged high desert.

Five National Guard helicopters continued the effort Tuesday, along with several private aircraft from the ranch where Fossett had been staying. But the Civil Air Patrol, which had 20 planes and 60 searchers aloft over the weekend, suspended further flights and left two planes and a small team on standby in Minden.

"We don't like to do that. It's against our nature to walk away from a search," Maj. Cynthia Ryan of the Nevada CAP said. "But at some point, you have diminishing returns."

Finding Fossett has been a daunting task. The search area is remote, with deep crevices that are difficult to scan from the air, and it is twice the size of New Jersey.

Ryan said volunteer CAP pilots had made 245 search flights since Fossett disappeared on Labor Day. The 60-year-old aviator had left the ranch of hotel mogul Barron Hilton that day to search for a good location to try to break another record, this one for speed on land.

Tips haven't panned out
Maj. Ed Locke of the Nevada Air National Guard said the guard's helicopters will continue flying and will be able to hover closer to the ground than the CAP planes. He said tips have dropped off. Search and rescue crews on the ground also continued their efforts as the search for Fossett entered its third week.

Lyon County Sheriff Allen Veil, whose county includes Hilton's ranch, said he's observed the private search and has seen "a sense of optimism that Mr. Fossett is still out there alive, and they're set on finding him."

But the sheriff also said it's possible that the organized search for Fossett might turn up nothing and some hiker or hunter eventually will come across the wreckage of Fossett's single-engine plane.

As the search continued on the edge of the Sierra in northern Nevada and eastern California, comparisons were being made to the mystery of Amelia Earhart's disappearance over the Pacific Ocean 70 years ago.

Ric Gillespie, leader of an effort this summer to find Earhart, who vanished in July 1937 during an around-the-world flight attempt, said the comparisons will continue to grow.

"We like to think that anything is findable with enough resources. But it could turn into another Amelia Earhart situation," said Gillespie, head of The International Group for Historic Aircraft Recovery, on Sunday.

"If they don't find something, the mystery element will grow and grow," he said.

Copyright 2007 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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