| 1 | CUA | China United Airlines Co., Ltd. | IATA: KN, Callsign: Lianhang, ICAO Callsign changed to China United. Designator KN reinstated by IATA. | PRC | AVCODES |
| 2 | CUA | China United Airlines Co., Ltd. | IATA: KN, Callsign: China United, ICAO Callsign changed from Lianhang. Designator KN reinstated by IATA. | PRC | AVCODES |
| 3 | CUA | China United Airlines | IATA: HR | | ICAO1 |
| 4 | CUAB | COSENTINO USA | | | SCAC4 |
| 5 | CUAC | CONNECTICUT AMERICAN CHARTERS INC | | | SCAC3 |
| 6 | CUAD | CUESTAS, ABRAM LOSANO & DAVID CASTI | | | SCAC3 |
| 7 | CUAG | CUSTOM AIR TRUCKING, INC | | | SCAC3 |
| 8 | CUAG | CUSTOM AIR TRUCKING INC | | | SCAC4 |
| 9 | CUAI | CUSTOM TRUX | | | SCAC4 |
| 10 | CUAK | CUSTOM LOGISTICS INC | | | SCAC4 |
| 11 | CUAM | CURRIE-ALEX MOTORS LTD | | | SCAC3 |
| 12 | CUAN | CURTIN, AUSTIN | | | SCAC3 |
| 13 | CUAO | COUNTRY AUTO | | | SCAC3 |
| 14 | CUAO | CULBERT FARMS | | | SCAC4 |
| 15 | CUAR | CUELLAR & SON TRUCKING CORP | | | SCAC3 |
| 16 | CUAT | CUSTOM APPLIANCE TRUCKING | | | SCAC3 |
| 17 | CUAV | CONNECTION TRUCK & AUTO | | | SCAC4 |
| 18 | CUAY | CURRIER TRAVEL AGENCY INC | | | SCAC3 |