flights: draw two narrow engine contrails and raise beacon

config.js

@@ -397,9 +397,14 @@ window.CONFIG = {
         contrailChance: 1.00,     // 0 = no contrails, 1 = every eligible jet
         contrailStartKm: 4,       // start after this distance from the airport
         contrailLifeS: 300,       // seconds before a trail disappears
-        contrailWidthM: 1400,     // full trail width
+        contrailWidthM: 1400,     // aircraft/trail scale width
+        contrailEngineWidthM: 700, // width of each engine contrail
+        contrailEngineOffset: { x: 0.36, y: -0.055, z: -0.14 }, // engine exhaust in model units
+        markingLightOffset: { x: 0.0, y: 0.235, z: 0.0 },       // top-centre fuselage beacon
         contrailFadeKm: 300,      // fully faded at this distance (ramp starts at 35 %)
         // contrailChance: 0.35, contrailLifeS: 120  // short sparse trails
+        // contrailEngineWidthM: 520, contrailEngineOffset: { x: 0.36, y: -0.055, z: -0.18 }
+        // markingLightOffset: { x: 0.0, y: 0.26, z: 0.05 }
         // Night contrast: a physically scaled contrail is a faint grey thread
         // that disappears at 4x pixel scale, so this is the night share of its
         // opacity (0.34 was the old value) and it also drives the gain on the