Northrop Grumman won't bid as a prime contractor for the Air Force's Next Generation Air Dominance platform, CEO Kathy Warden said Thursday, though she left open the possibility of bidding on the Navy's version. When the Air Force requested proposals for the sixth-generation fighter jet earlier this year, Northrop informed the service it won’t be submitting its own, Warden said during the company’s second-quarter earnings call. Northrop is responding to other primes’ requests as a supplier, she said, particularly for...