FLIGHT SIMULATOR

Malaysian police have searched the homes of the captain, Zaharie Ahmad Shah, 53, and first officer, Fariq Abdul Hamid, 27, both in middle-class suburbs of Kuala Lumpur close to the airport.

Among the items taken for examination was a flight simulator Zaharie had built in his home.

A senior police officer with direct knowledge of the investigation said the programs from the pilot's simulator included Indian Ocean runways in the Maldives, Sri Lanka, Diego Garcia and southern India, although he added that US and European runways also featured.

"Generally these flight simulators show hundreds or even thousands of runways," the officer said.

"What we are trying to see is what were the runways that were frequently used. We also need to see what routes the pilot had been assigned to before. This will take time, so people cannot jump the gun just yet."

Some US officials have expressed frustration at Malaysia's handling of the investigation. The Malaysian government still had not invited the FBI to send a team to Kuala Lumpur by Monday, two US security officials said.

Malaysia's Defence and Acting Transport Minister, Hishammuddin Hussein, told Reuters the country was co-operating with the FBI.

"I have been working with them," he said on Tuesday. "It's up for the FBI to tell us if they need more experts to help because it's not for us to know what they have."

Hishammuddin added that he had spoken to US Defense Secretary Chuck Hagel and "my counterpart in China" about the search for the plane, now in its 11th fruitless day.

The US Navy is sending a P-8A Poseidon, its most advanced maritime surveillance aircraft, to Perth, in Western Australia, to assist with the search.

The disappearance of the plane was a major topic of conversation at the International Society of Transport Air Trading in San Diego, an annual gathering of 1,600 airplane makers, buyers and lessors.

"The people that I deal with are looking at this with great concern - it appears considerable efforts may have gone into cloaking the aircraft," said Robert Agnew, chief executive of aviation consultants Morten Beyer & Agnew.