| 1 | HLX | Hapag-Lloyd Executive GmbH | IATA: 3H, Callsign: Excellence, Designator 3H* recalled by IATA | D | AVCODES |
| 2 | HLX | Hapag-Lloyd Express GmbH | IATA: X3, Callsign: Excellence, | D | AVCODES |
| 3 | HLX | INAER Helicopteros | Callsign: Excellence, Designator 3H* recalled by IATA | D | AVCODES |
| 4 | HLX | Hapag-Lloyd Express GmbH | IATA: X3, Callsign: Yellow Smile, Merged into TUIFly GmbH. | D | AVCODES |
| 5 | HLX | Hapag-Lloyd Express (TUIfly) | IATA: X3 | | ICAO1 |
| 6 | HLX | North American Car Corp. | 7/1937-4/1947 | | NAKINA |
| 7 | HLX | Humane Live Stock Car Co. (North American Car Corp.) | 7/1930-7/1935 | | NAKINA |
| 8 | HLX | (North American Car Corp.) | Apr-38 | | NRHS |
| 9 | HLX | NORTH AMERICAN CAR CORP. (HUMANE LIVE STOCK CAR CO.) | | | PWRC |
| 10 | HLXA | HALL EXPRESS | | | SCAC4 |
| 11 | HLXC | HELIX COURIER LIMITED | | | SCAC4 |
| 12 | HLXI | HULL TRANSPORTATION INC | | | SCAC4 |
| 13 | HLXL | HELIX LOGISTICS LLC | | | SCAC4 |
| 14 | HLXM | HL TRANSPORTES | | | SCAC4 |
| 15 | HLXN | HALLS TRANSPORTATION | | | SCAC4 |
| 16 | HLXO | HALL TRANSPORT | | | SCAC4 |
| 17 | HLXP | HOTLINE EXPRESS LLC | | | SCAC4 |
| 18 | HLXS | HELIX SEISMIC EXPLORATION INC | | | SCAC4 |
| 19 | HLXT | HILLTRUX TANK LINES INC | | | SCAC4 |
| 20 | HLXU | HAPAG LLOYD A.G | | D | BIC |
| 21 | HLXU | HAPAG LLOYD A G | | | SCAC4 |
