Air combat is shifting away from the old formula of staying far outside a missile belt and firing inward. For the U.S. Air Force’s planned F-47, the more important change is the ability to cross into defended airspace, find a fleeting target, and hit it before that target disappears. That is where the Stand-in Attack Weapon, or SiAW, changes the discussion. Instead of acting like a classic long-range cruise missile, SiAW is built for launch from a stealth aircraft already inside the danger zone. The result is a much shorter flight to target, less time for a mobile battery to relocate, and a better chance of catching systems that only emit briefly, such as search radars, fire-control nodes, GPS jammers, or other pieces of an integrated air-defense network.
The F-47 matters here because the aircraft is being designed as more than a replacement for the F-22. Air Force leaders have described it as a long-range, stealthy centerpiece of NGAD, with a combat radius of more than 1,000 nautical miles and speed above Mach 2. Those figures point to an aircraft built to travel deep, stay survivable, and arrive with enough margin to do more than escort. In practical terms, that makes it a logical carrier for an internally mounted weapon aimed at time-sensitive ground threats.
The internal carriage point is critical. A stealth fighter keeps its radar signature under control by hiding weapons inside the fuselage rather than hanging them on external pylons. For a stand-in strike concept, that means the jet can remain low-observable until the last possible moment, open the bay briefly, release the weapon, and move on. Against systems in the S-400 class, which depend on layered sensors and engagement geometry, that compressed sequence is part of the weapon as much as the missile itself.
There is also a wider architectural shift behind the concept. The F-47 is expected to operate inside a “family of systems” rather than as a lone hunter, and the Air Force is already moving ahead with uncrewed teammates. In March 2025, the service designated YFQ-42A and YFQ-44A prototypes for its Collaborative Combat Aircraft effort, reinforcing the service’s push toward human-machine teaming. That matters because a stand-in weapon becomes far more dangerous when targeting data can come from multiple offboard sensors instead of only the cockpit crew. A drone, satellite, or other aircraft can spot a radar, pass coordinates across the network, and let the F-47 act as the forward shooter. The aircraft does not need to build the whole picture alone.
That approach fits a long-running reality of air warfare: the first goal is not simply survival, but breaking enough of the defensive web to let the rest of the force operate. Older rollback concepts relied on mass, deception, electronic attack, and repeated strikes to turn contested airspace into usable airspace. A stand-in pairing such as F-47 and SiAW updates that logic for an era of mobile launchers, denser jamming, and faster kill chains. The real value is tempo.
If the aircraft can penetrate, receive updated targeting data, and launch a fast weapon from close range, it can attack the part of a modern air-defense system that is hardest to protect: its need to move, radiate, and coordinate in real time. That would not make integrated defenses irrelevant. It would make them easier to fracture, creating the kind of corridor that allows less survivable aircraft to follow.
