Gust, the Stage 2 boss, reffered as a "Battle Machine"(same term as Twin Rat)

Model from Ray Tracers, an spiritual successor of Chase H.Q. weirdly labled as a Ray series game(focused at Shoot em Ups)

-Gust alongside Blast-Type are the two exotic bosses of the game, by being aerial vehicles instead of car and derivates
-Gust features two rocket launcher pods on the wing supports, they rotate during reload alongside it can fly without them after damaged
-Stage 5 model uses a different colour(dark red), wing support is simplified, and the pods differ(flat line instead of 6 slots)
-Leftovers of Twin Rat can be seen on Gust, while Cindy's helicopter(not seen in-game, only in FMVs) leftovers are seen on Stage 5 Gust

Extracted using the modified build of Duckstation by scurest based on Rickomax's Avocado, huge kudos to him
https://www.vg-resource.com/thread-42701.html
https://github.com/scurest/duckstation-3D-Screenshot/releases/tag/latest-3d-screenshot

Notes :
-Texture basis from Duckstation, not needing to use Beetle PSX HW to extract the textures anymore
--Revision previously suggested by Peardian, as the original Avocado texture rips would extract removing unused areas with transparency, due to the natural reaction of the UV map structure and how the emulator behaves
--The model uses CLUT transparency, this effect can be recreated with the alpha mask available on the folder(you'll need to assign manually as Blender will always export as Alpha Blend instead of Hashed or Clip)
-Icon renders was made using the Emission shader material, Film Transparency, and rendered on Blender's Eevee Renderer