| 1 | HEL | Helicol. Helicopteros Nacionales de Colombia | Callsign: Helicol, | CO | AVCODES |
| 2 | HEL | Helicol | | | ICAO1 |
| 3 | HEL | Hellenic Train S.A. | | GR | TRAFFIC |
| 4 | HELE | H E LOGISTICS GROUP INC | | | SCAC4 |
| 5 | HELF | Helf Bauunternehmung GmbH & Co.KG | | DE | VKM |
| 6 | HELG | HELLO EXPRESS INC | | | SCAC4 |
| 7 | HELL | HEARTLAND ENTERPRISES, LLC | | | SCAC4 |
| 8 | HELL | Josef Hell Bauunternehmen GmbH | | DE | VKM |
| 9 | HELR | Helrom GmbH | | D | TRAFFIC |
| 10 | HELS | | City: Helsinki | FIN | TRAFFIC |
| 11 | HELT | HELT ENTERPRISES INC | | | SCAC4 |
| 12 | HELU | RABANCO COMPANIES | | | SCAC4 |
| 13 | HELV | HURRICANE EXPRESS LOGISTICS INC | | | SCAC4 |
| 14 | HELW | HEARNE, L. A | | | SCAC1 |
| 15 | HELW | HEARNE, L A CO | | | SCAC4 |
| 16 | HELX | HELM Financial Corp. | added 7/1995; 7/2000-7/2005 | | NAKINA |
| 17 | HELX | HM Joint Venture | added 7/1993; 1/1994; eliminated 7/1995 | | NAKINA |
| 18 | HELX | HELM Equipment Leasing Co. | added 1/1987 | | NAKINA |
| 19 | HELX | HELM Financial Corp. | added 10/1986 | | NAKINA |
| 20 | HELX | HELM Financial Corp. | added 10/86 | | NRHS |
| 21 | HELX | HELM Equipment Leasing Co. | added 1/87 | | NRHS |
| 22 | HELX | HM Joint Venture | added 7/93; 1/94; eliminated 7/95 | | NRHS |
| 23 | HELX | HELM Financial Corp. | added 7/95; 7/2000 | | NRHS |
| 24 | HELX | HELM EQUIPMENT LEASING CORPORATION (HELM FINANCIAL CORP.) | | | PWRC |
| 25 | HELX | Helm Financial Corporation | | | RSRV |
| 26 | HELX | HELM FINANCIAL CORPORATION | | | SCAC4 |
| 27 | HELY | HAMMONDS ENTERPRISES LLC | | | SCAC4 |
