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(CNN) - The search area for Malaysia Airlines Flight 370 has narrowed in the past few days, and the U.S. has contributed some of its most advanced air craft and technology to aid in the search.
But searchers are still no closer to finding the plane than they were a few days ago, says Pentagon Press Secretary Rear Admiral John Kirby.
"The weather has made it even more hard to do," said Kirby. "I don't think we're any closer to finding where the air craft is at this point."
Earlier Tuesday, Australian officials put some perspective on the search area.
"We're not searching for a needle in a haystack. We're still trying to find where the haystack is," said Australia Vice Chief of Defense Mark Binskin.
Kirby went further.
"We're trying to find the farm that the haystack is on right now," he said.
The best tool the U.S. has provided to the search is a Towed Pinger Locator, a device that is towed by a ship, and crawls the ocean floor listening for the pings of the plane's flight-data recorder. It was how searchers found the wreckage of Air France Flight 447.
"But you need to have a well-defined debris field. You have to have an idea of where this wreckage is. In Air France, it was 40 square miles. We're nowhere near close to narrowing it down to even that," said Kirby.
For more of our interview with Rear Admiral John Kirby, check out the video above.