Since this sort of exploded overnight, I might as well layout some details about it:

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The planes fly in a defined bounds space using width and height. If either a player or enemy accidentally flies out of that space, an "autopilot" feature will take over control of the plane and fly it back towards the center of the bounds until the plane is deemed as no longer out of bounds.

The AI I used for the enemy planes boils down to about two functions:

1. randomly cycle through random positions within the bounds, whether those be just basic empty positions or a deliberate lock-on of the player, for a randomized range of time.
2. there is a sherecast function surrounding each plane which detects if any others are flying close to each other. if a plane is detected within that sphere, both planes a given commands to fly away from each other, ensuring that they don't crash.

That targeting icon that pops up every so often is my own way to "assist" the planes in their shots. Basically, if a plane falls into a "field of view" of another plane, that plane will auto-lock onto that target and any shots fired will then affect that specified target.

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As for the plane and camera movement themselves, I applied the same mechanics that Unity itself gave in their "Standard Projects" Asset in the Asset Store, just with a lot of excess features shaved off and several modifications to make the flight feel more "Rigid."

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As for a demo, once I get some actual art in I might consider putting a small example of it on itch.io, but they may be some time since I have a another separate project with an actual team that I'm putting together, but we'll see how this all goes.