PIEDMONT AVIATION <PIE> BOARD TO MEET TODAY Piedmont Avaition Inc's board of directors will conduct a special meeting beginning at 1400 est today, a Piedmont spokesman said. The spokesman would not say what was on the agenda. In mid-February, Piedmont said its board would meet to discuss all proposals to acquire the company. Its board also withdrew a recommendation to accept a 65 dlrs a share cash offer from Norfolk Southern Corp <NSC> in light of a competing revised bid from U.S. Air Group Inc <U>. U.S. Air offer to buy 50 pct of the company's stock for 71 dlrs a share cash, and the remaining for 73 dlrs a share of its stock.