Carlyle Group continues to sell shares of Wesco Aircraft Holdings Inc., a Valencia aerospace parts supplier, the companies announced Wednesday. Affiliates of the Washington, D.C. private equity firm are offering 6 million shares at an undisclosed price. The firm also could sell an additional 900,000 shares in the Wesco should the offering sell out. If all 6.9 million shares sell, that would leave Carlyle with a 31.1 percent stake in Wesco. In May, Carlyle sold 17.25 million shares in Wesco priced at $16. Carlyle bought a majority stake in the company in 2006 when it was privately held, and took it public in July 2011, raising $315 million in the initial public offering. Wesco shares fell 31 cents, 1.37 percent, to close at $19.45 on the New York Stock Exchange.