{
  "publisher": "FAA Aeronautical Information Services",
  "service": "https://services6.arcgis.com/ssFJjBXIUyZDrSYZ/ArcGIS/rest/services/Class_Airspace/FeatureServer/0",
  "item": "https://www.arcgis.com/home/item.html?id=c6a62360338e408cb1512366ad61559e",
  "effective_from": "2026-10-29T09:01:00Z",
  "effective_until": "2026-12-24T09:01:00Z",
  "retrieved": "2026-10-29",
  "chart_registration": "dist/chart/tower-study.json",
  "chart_edition": "2026-09-03 (historical reference, not current)",
  "processing": "Project WGS84 service GeoJSON through original NAD83 Lambert Conformal Conic GeoTIFF transform; preserve complete fullPolygons for classification; clip display to excerpt; simplify display only by 0.04 review pixel (~5.1 m).",
  "notes": [
    "Educational visualization, not for navigation. FAA dataset is a cycle snapshot, not live NOTAM/tower status.",
    "Clipped edges are chart cutaways, not legal airspace boundaries.",
    "LAX Special Flight Rules Area is part of Class B Area A at 3500 and 4500 MSL, not a Class B exclusion slab; operational procedures not modeled.",
    "SFC classification uses illustrative terrain. Rendered SFC volumes extend to zero MSL underneath the terrain mesh; they are not terrain-following bottoms or surveyed terrain."
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