Rei's actions were even more extreme in the novel version of this scene and more morally questionable. In the novel, the plane was tentatively identified as a Sylphid, not a Super Sylphnote This is significant because there are only 13 Super Sylphs in existence, whereas the Sylphid is a common front-line fighter, so the chances of it possibly being a friendly are much higher. Yukikaze's IFF also never designates it as an "Enemy" but remains as an "Unknown." Despite this, Rei destroys it anyway. Later, Major Booker even brings up the possibility that the aircraft may have been a United Nations spy plane trespassing on Faery, and not a JAM at all. Rei may or may not have killed a fellow human in that engagement. We never find out.
The Aerial Canyon Chase between Yukikaze and the Copy Sylph in Operation 01. Followed by Yukikaze flying backwards in order to shoot down a nuclear missile!
In Good Luck, Yukikaze, one thing that Yukikaze does in particular when trapped in the JAM alternate dimension and it is clear they intend to capture her, Rei, & Katsuragi, she fires off two missiles, one targeted at the Copy Super Sylph and the other at herself... and then lets the JAM know exactly what she intends to do, playing a deadly game of chicken to see who caves in first. The JAM blink.