Survivability and quality should be the Air Force's focus, service Secretary Frank Kendall said, compared to former-Defense Secretary Gen. Jim Mattis' priority of lethality and the Cold War-era mindset of maintaining the highest quantity of platforms. The average service aircraft is about 30 years old, Kendall said during a Brookings Institution interview Monday, and it’s aging every day. To meet the threats posed by China and Russia, the Air Force needs high-quality capabilities rather than just a lot of planes,...