Yukikaze (2002)

Sentou Yousei Yukikaze occurs in the near future. Some decades ago, an alien force known as the JAM invaded Earth through a dimensional portal that appeared over Antarctica. The United Nations established a defense force to oppose the threat and after a series of bloody battles, managed to push the enemy back to the other side of the portal, which is a planet named "Fairy" by the humans. However, the battle still rages on. The main character, Rei Fukai, pilots the Super Sylph B-503 fighter, nicknamed "Yukikaze", an advanced armed tactical reconnaissance plane equipped with a near-sentient AI computer system, and belongs to the Special Air Force (SAF), the strategic recon wing of Fairy Air Force (FAF). After one mission, B-503 and crew encountered what appears to be a friendly Super Sylph, but without IFF. Yukikaze, the AI, designated the other plane as hostile, and Rei opened fire, shooting it down. Is Rei's action justified? Is the AI unreliable? Or is there something really unexplained happening?