Wall Street ends mostly flat, Procter, AT&T tumble

By Rodrigo Campos NEW YORK (Reuters) - The S&P 500 and Nasdaq ended flat on Wednesday with Boeing's five-year high among the day's highlights, but weakness in Procter & Gamble and AT&T kept the Dow in negative territory. Procter & Gamble shares fell 5.8 percent to $77.12 after the world's largest household products maker issued a profit outlook that was below expectations. It was the stock's biggest drop since January 2009, and contributed to a 1.7 percent drop in the S&P consumer staples index . ...