B-2 Spirit was.

The B-2 Spirit stealth bomber has never been confirmed shot down, despite persistent rumors—particularly involving Serbia—which remain unsupported by credible military or intelligence sources. The only confirmed incidents involve accidents: in 2008, a B-2 crashed in Guam due to moisture affecting air data sensors, causing a stall during takeoff; both pilots survived. Another crash occurred in 2021 during a landing in Missouri, but it was not linked to any hostile action.

The B-2’s stealth capabilities stem from its radar-absorbing materials, unique flying wing design, and minimal infrared signature. With a radar cross-section comparable to that of a bird, it is nearly undetectable to radar systems. The bomber is also equipped with advanced electronic warfare systems and benefits from precise mission planning, allowing it to effectively evade enemy air defenses.