DAYTON, OH -- Determining whether the current plan for the sixth-generation fighter jet is the right fit for the Air Force's fleet will take a few more months, Secretary Frank Kendall said today, delaying the schedule for the program, which expected a contract to be signed this summer. The main platform for the Next Generation Air Dominance family of systems is still likely to be a crewed aircraft, Kendall told attendees at the Life Cycle Industry Days conference here, but...