MIAMI, Aug. 8 -- AT&T Latin America has initiated a public offering of 35 million shares of its Class A common stock pending the finalization of the FirstCom and AT&T Latin America merger. The registration statement was filed with the Securities and Exchange Commission. Morgan Stanley Dean Witter will manage the offering along with Credit Suisse First Boston. J.P. Morgan & Co., Merrill Lynch & Co. and Salomon Smith Barney will act as co-lead managers.