Open for business? A Libya under reconstruction poses some potential.Although circumstances in Libya are still difficult more than a year after the overthrow of Moammar Gadhafi, the assessment of the head of the U.S.-Libya Business Association is that the country presents attractive opportunities for American firms.The association's executive director, Charles W. Dittrich, visited Tripoli and Benghazi for a week in April along with 37 U.S. business leaders. Speaking Tuesday in Pittsburgh as a guest of the American Middle East Institute, Mr. Dittrich said he sees a potential match between southwestern Pennsylvania's assets in medical care, education, energy and environmental expertise and the needs of a Libya pursuing reconstruction after 42 years of rule by Mr. Gadhafi and the ensuing civil war.