The controller button in the top-left corner picks which device flies, for when there is more than one plugged in.
A real-time AH-64E flight model running in the browser: fixed-step rotor and airframe physics at 120 Hz, a phosphor HUD, and about 600,000 triangles of gunship, in TypeScript and Three.js.
AH-64E Apache 3D model by Jeyhun1985.