NEW YORK - APRIL 15: Richard Anderson (C), CEO of Delta, and Doug Steenland (R), President and CEO of Northwest Airlines, and Mike Campbell (L), VP of Delta, answer questions during a press conference April 15, 2008 in New York City. Delta Air Lines and Northwest Airlines have announced a merger that will create the world's largest airline carrier if approved, saying that the merger will improve access for travelers and help deal with skyrocketing fuel costs.