"Peter Jennings hasn't returned to the air since his April 5 announcement that he has lung cancer, but he's often shaping "World News Tonight" from behind the scenes," David Bauder reports. "Jennings sometimes participates in the 9 a.m. daily conference call to set assignments for the day, said Jon Banner, executive producer of "World News Tonight." Banner will fax scripts to Jennings, who will frequently call or e-mail suggestions." Banner would not discuss Jennings' condition...