Iran developed air defence systems that use passive infrared sensors rather than radar to target aircraft like F-35A. This method proved effective in Yemen when used by Iranian-backed Houthi rebels

The F-35 will also serve as a test bed for technologies that will become commonplace in the next generation of jets. Flying in coordination with AI-enabled drones will become a staple of any sixth-generation fighter, and those new fighter tricks will likely first arrive in the form of the F-35.

Both Lockheed andd Martin had long, storied histories before their merger, and both began with the same type of odd aircraft.

A military aircraft does not just vanish into thin air. What it means when the word 'stealth' is coined with any military aircraft is that engineers have conditions under which detection becomes difficult enough to matter when the stakes are high.