A number of new developments in May indicate the Pentagon's long-term fighter aircraft plans may be ripening for revision. The Navy and Air Force, after false starts and extended internal reviews, have clarified plans for pursuing new air-dominance capabilities -- potentially new fighter aircraft -- needed around 2030, an occurrence that comes as the Pentagon for the first time formally raised the prospect of new scenarios for the F-35 Joint Strike Fighter program, including a potentially smaller fleet. Last month,...