how comes iran is able to shoot down us most advanced fighter jets

Short answer: It usually comes down to how the aircraft is being detected and targeted, not a simple “Iran beat stealth” story. In the reports available, the claims center on heat-seeking/infrared tracking, short-range air defenses, and layered missile systems rather than radar alone, and the exact details of each incident are still not fully verified.

What likely matters

Iran’s defenses are described as a mix of indigenous systems and imported platforms like the S-300 PMU2 and the Bavar-373 , plus shorter-range interceptors and mobile launchers. That kind of layered setup can be dangerous to aircraft flying at the wrong altitude, speed, or route, especially during a busy combat environment.

Why stealth is not invincible

Stealth aircraft are designed mainly to reduce radar visibility, but that does not make them invisible to infrared , optical , or other sensor types. One report said analysts believed Iran may have used an infrared search-and-track approach and a heat-seeking or loitering missile to exploit the jet’s heat signature instead of relying on radar lock.

Important caveat

A lot of the viral claims are still unconfirmed or disputed. Some reports say the aircraft identity and footage are not independently verified, and different outlets describe the incident as a claimed shootdown, an emergency landing, or an ongoing investigation.

In plain English

If Iran did bring down a top-tier US fighter, it would more likely be because of a good missile ambush, sensor fusion, timing, and favorable flight conditions than because Iran suddenly matched US air power head-on. That is the main reason even advanced jets can be vulnerable over contested airspace.

The short version: stealth helps a lot, but it does not protect against every sensor or every missile.

TL;DR

Iran’s reported success, if confirmed, likely came from non-radar targeting and layered air defenses , not from “outclassing” US aircraft overall. The story is still developing, so treat dramatic claims carefully until independent verification is clearer.