Citing strong demand for its communications services, Sprint Nextel reported consolidated revenue of $11.5 billion, an increase of 66 percent compared to the year-ago period. Operating income was $863 million versus $1.04 billion in the first quarter of 2005.For the quarter, diluted earnings per share were 14 cents, compared to 31 cents per share for the first quarter of 2005. The year-ago results do not include the Nextel operations. "In the first quarter, we continued to advance on our operating and strategic goals and integrate the affiliates...