flights: full CONFIG.flights parameterization (altitude, count, speed, holds, destination weights, contrail chance/alt/life/width) + curved random-destination routing

vendor/LICENSE

@@ -8,6 +8,11 @@ stars.json - star catalogue derived from the Yale Bright Star Catalogue
 (5th ed., public catalogue data). Generated for this project; see the
 real-sky notes in clouds3d.js.
 
+plane3d.js - low-poly airliner mesh (599 triangles, flattened, no textures)
+Derived from 'Passenger Airplane' by Grab3D (https://grab3d.com), CC0 1.0
+(public domain dedication). Decimated and repacked for this project; the
+derived mesh is offered under CC0 as well.
+
 clouds3d.js - original code for this project (same license as the
 repository root LICENSE).