How well each carrier keeps its promises. We compare every observed arrival (from AIS) against the carrier's own published ETA — the schedule reliability score nobody publishes, because it doesn't flatter them.
On-time = arrival within ±24h of the published ETA. A carrier is rated only once we have enough confirmed arrival-vs-ETA matches to be fair; carriers we observe but can't yet match enough are listed separately as coverage building — not scored as zero. Coverage is strongest on European routes today and expanding.
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Observed in our AIS but not yet enough schedule matches to rate fairly (e.g. carriers whose routes are mostly outside current AIS coverage, or whose schedules we've just started capturing).