WASHINGTON, May 29 (Reuters) - The U.S. State Department

has approved the potential sale of Black Hawk helicopters and

related equipment to Austria and Sweden, the Pentagon said on

Wednesday.

The sale to Sweden would be for an estimated cost of $900

million and the sale to Austria would be for an estimated cost

of $1.05 billion, the Pentagon said. The principal contractor

for both deals would be Lockheed Martin's ( LMT ) Sikorsky unit.