The Northrop Grumman B-21 Raider remains on track to enter service in 2027. Currently, there are an unknown number of B-21s under construction, and the aircraft is now in advanced testing. After it enters service, it will complement the B-1B, B-2, and B-52 until it has sufficiently matured and is available in substantial numbers. The B-1 is expected to phase out by around 2037 and the B-2 sometime afterwards. While many of the B-21's improvements remain classified, one area where observers have identified an apparent design evolution is its trailing-edge control surfaces. Let's examine how new photos of the Raider's…