Distinct subjects for predicate ns4:callsign sorted by frequency
| Resource | Count |
|---|---|
| Koninklijke Luchtvaart Maatschappij | 4 |
| Northwest Airlines | 2 |
| Scandinavian Airlines | 2 |
| Korean Air | 1 |
| Lufthansa | 1 |
| Swiss International Air Lines | 1 |
| Resource | Count |
|---|---|
| Koninklijke Luchtvaart Maatschappij | 4 |
| Northwest Airlines | 2 |
| Scandinavian Airlines | 2 |
| Korean Air | 1 |
| Lufthansa | 1 |
| Swiss International Air Lines | 1 |