{ "date": "2026-10-06", "dataset": "Flight-route cross-checked nonstop schedules", "method": "Six exact production SpaceSolver fits: random seeds 71, 72 and 73; free 3D initial points; minEdges=4, no duration cutoff, no time subtraction, up to 30,000 steps. No geographic or sphere constraints.", "findings": [ "SJO retains five European neighbors in wide-body mode, with radius ratio 1.15\u20132.05 despite local error about 1.2%. Low residual does not uniquely locate it.", "Wide-body mode removes nearby regional constraints from Vancouver and Calgary. Their shortest retained measured links are Toronto at 4.66h and 4.20h.", "All-aircraft mode adds regional constraints. In seed 72, YVR, YYC and YEG have radius ratios 0.98, 0.94 and 0.97, but other starts still put them inward.", "Canada\u2013US proximity is often plausible: Toronto and Montr\u00e9al cluster with eastern US airports; Vancouver clusters with Seattle and Portland. Some west-Canada inward placement remains dependent on the local minimum and the mismatch between travel times and straight-line distances.", "All-aircraft and wide-body errors use different observations and are not directly comparable. Airport adjacency verification uses a crowdsourced route index, not certification of actual operated flights." ], "runs": [ { "aircraft": "widebody", "seed": 71, "airports": 161, "edges": 1851, "iterations": 30000, "stable": false, "normalizedDistanceError": 0.04327494013395142, "inspectedAirports": [ { "airport": "SJO", "edges": 5, "localError": 0.012570364681965243, "radiusRatio": 2.051179549726199, "nearestFittedAirports": [ { "airport": "MCO", "separationHours": 6.983489799851677 }, { "airport": "JFK", "separationHours": 9.542384247723987 }, { "airport": "BOS", "separationHours": 9.589743393318392 }, { "airport": "EWR", "separationHours": 9.611535213257268 }, { "airport": "YUL", "separationHours": 9.655800310393705 }, { "airport": "IAD", "separationHours": 9.995696437005186 } ], "shortestConstraints": [ { "a": "MAD", "b": "SJO", "target": 10.875, "fitted": 10.884979120115187, "error": 0.009979120115186646, "relativeError": 0.0009176202404769329, "twoWay": true, "records": 4 }, { 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