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OpenSky's state-vector spec allows null longitude/latitude, and every live /states/all response carries such rows (about 50 of 7,800). The normaliser rejects them, so admitRecords reported complete: false on effectively every poll. While a snapshot is incomplete, FlightRecords.absence() retains any aircraft received in the last five minutes, which meant the stale fade, MISSING_POLL_LIMIT and the landed fast-cull never ran: vanished and landed aircraft stayed on the globe at full opacity for up to five minutes. admitRecords now takes an optional unpositionedId(row). A rejected row it names is a contact without a position: its id is returned in retainIds and the row does not count against completeness. OpenSky opts in for rows with an ICAO24 address and strictly null longitude and latitude; the id comes from the same helper the normaliser uses. Rows with no usable id, out-of-range or half-null coordinates, truncated rows and positioned duplicates still make the snapshot incomplete, and a nonempty feed with no positioned rows is still malformed. absence() retains exactly the retainIds aircraft under the existing five-minute bound, except likely-landed ones, which keep the landed limit. Everything else ages out normally. Military readsb admission does not opt in and is unchanged.