| 1 | HLL | Eliliguria International S.p.A. | Callsign: Eliliguria, Name changed from Eliliguria | I | AVCODES |
| 2 | HLL | Havelet Leasing Ltd. | Callsign: Havelet, | GB | AVCODES |
| 3 | HLL | Eliliguria | Callsign: Eliliguria, Name changed to Eliliguria International S.p.A. | I | AVCODES |
| 4 | HLL | Holiday Airlines Company | | T | AVCODES |
| 5 | HLL | Helicentre Liverpool Limited | Callsign: Fusion, | GB | AVCODES |
| 6 | HLLA | HOLLIS, ALVIN & COMPANY | | | SCAC4 |
| 7 | HLLB | HOLLENBECK ENTERPRISES INC | | | SCAC4 |
| 8 | HLLD | HOLLAND TESTERS LTD | | | SCAC4 |
| 9 | HLLE | HOLLAND ENTERPRISES INC | | | SCAC4 |
| 10 | HLLF | HALLS FREIGHTWAY INC | | | SCAC4 |
| 11 | HLLG | HILL LOGISTICS INC | | | SCAC4 |
| 12 | HLLH | HILL, GRAHAM | | | SCAC4 |
| 13 | HLLI | HISS LOGISTICS LLC | | | SCAC4 |
| 14 | HLLL | HOUSTON LOGISTICS LLC | | | SCAC4 |
| 15 | HLLN | HOLLAND TRUCKING CO INC | | | SCAC4 |
| 16 | HLLP | HALL TRUCKING | | | SCAC4 |
| 17 | HLLQ | HILLSIDE LOGISTICS INC | | | SCAC4 |
| 18 | HLLR | HOLLIE TRANSPORTATION | | | SCAC4 |
| 19 | HLLS | HILLIUS TRUCKING | | | SCAC4 |
| 20 | HLLU | HELLENIC LINES LIMITED | | | SCAC4 |
| 21 | HLLW | HEYL LOGISTICS LLC | | | SCAC4 |
| 22 | HLLX | Helm Financial Corp. | added 1/2002; 7/2005 | | NAKINA |
| 23 | HLLX | Helm Locomotive Leasing | added 1/1993; 1/1994-7/2000; eliminated 4/2001 | | NAKINA |
| 24 | HLLX | Helm Locomotive Leasing | added 1/93; 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 25 | HLLX | HELM LOCOMOTIVE LEASING (HELM FINANCIAL CORPORATION) | | | PWRC |
| 26 | HLLX | Helm Financial Corporation | | | RSRV |
| 27 | HLLX | HELM LOCOMOTIVE LEASING | | | SCAC4 |
| 28 | HLLY | HILL, TERRY INC | | | SCAC4 |
