Haven’t done a post in a month but I will be explaining about yukikaze.

on this image you see Rei Fuki being intercepted by the Grey Sylph. Here is a Wikipedia article explaining. One day, however, an encounter with the "Grey Sylph" (a JAM duplicate of the Yukikaze) lands him in hot water with his superiors. During another patrol, Fukai is captured by JAM clones wanting to study the plane. He kills one of his captors and escapes with the plane from an alien entity disguised as a FAF forward airbase but ends up being pursued and shot down by the "Grey Sylph". As the "Grey Sylph" attempts to finish off Fukai's aircraft, the Yukikaze AI hijacks an FRX-99, a prototype UCAV that was undergoing operational tests at that time, and uses it to destroy the "Grey Sylph". The AI uploads its files to the FRX-99, ejects Fukai, and obliterates Yukikaze's wreckage.

yep, here what we see is the Grey Sylph on the back intercepting the damaged Sylph