AMERICAN AIRCRAFT CORP BUYS PRIVATE FIRM <American Aircraft Corp> said it has acquired a 51 pct interest in privately-held <Hunter Helicopter of Nevada, Inc>. The purchase was made for an undisclosed amount of American Aircraft stock, the company said. It said the acquisition will increase shareholder equity in American Aircraft to 45 cts per share from 18 cts per share. Hunter Helicopter builds two-passenger helicopters that retail for about 50,000 dlrs.