“A supersonic stealth aircraft would be take. Out in short order.”
Depends on how supersonic it is.
Today,unless these scientist have figured a way to reduce the aircrafts skin temperature it doesn’t really matter.The infrared detection sensors are so sensitive that any significant heat signature will be detected.
That’s one of the things that Northrup has in its favor.Its had plenty of time to research new defensive measures for the New B21 as well as the B2.
Everybody else is starting from square one.