SkyVector (skyvector.com) is the primary free aeronautical chart viewer used by pilots and researchers worldwide. The tab is centered on coordinates 37.27°N, -115.80°W — the exact location of the Groom Lake/Area 51 complex in the Nevada Test and Training Range. Chart type: VFR Sectional (chart=17, zoom=5). RESTRICTED AIRSPACE: The Nellis Air Force Range contains some of the most extensive restricted airspace in the continental US: R-4806 (Nellis), R-4807 (Nellis), and R-4808 (Groom Lake) — the last covering the Area 51 / Groom Lake facility itself. These areas are designated “Restricted” meaning flight is prohibited at all times without specific authorization from the controlling authority (Nellis AFB). Airspace extends from the surface to unlimited altitude in the core zones. The presence of these restrictions is public, published, and on every aeronautical chart — the government has acknowledged this airspace exists even when denying the base’s existence before 2013. JANET AIRLINE: Operated by AECOM/EG&G for the US Air Force. A fleet of unmarked Boeing 737 aircraft with a distinctive red stripe and no public callsign. Daily shuttle flights from Las Vegas Harry Reid International (terminal 2, gate 14) to Area 51 (Groom Lake) and to the Tonopah Test Range. Visible to anyone at the Las Vegas airport. Flight plans are filed but destinations are classified. The aircraft use the callsign “JANET” on frequency, with no published destination. An estimated 1,500-2,000 personnel commute daily. PAPOOSE LAKE / S4 GEOMETRY: The Papoose Lake dry lakebed — Bob Lazar’s claimed location for S4 — is located approximately 15 miles south of the main Groom Lake facility, at approximately 37.11°N, 115.84°W. Both locations fall within or adjacent to the Nellis restricted airspace complex. The terrain between them is separated by the Papoose Range mountains, explaining why S4 would not be visible from Area 51. OPEN SOURCE INTELLIGENCE VALUE: SkyVector provides the aeronautical chart layer that allows researchers to map restricted areas, identify JANET flight paths, and cross-reference witness coordinates against official airspace boundaries. The existence of active, extensive restricted airspace around Papoose Lake — even if not specifically named — is a primary source document confirming that the entire zone is under the highest level of security.