The author says the jungle is procedural, so the scene is generated in code rather than loaded from 3D models or image files.
The prompt asks for many aircraft systems at once (folding wings, retractable gear, flaps, dive brakes, two paint schemes, autopilot), which sets a detailed scope for one build.
Delivering everything as a single HTML file keeps the scene self-contained and easy to run.
Reference prompt
Remix template
Build a [PRODUCT] in Three.js with [FEATURES]. Deliver it as one HTML file with no external 3D models or image files, and generate all geometry and terrain procedurally.