| 1 | HPL | Heliportugal | | | ICAO1 |
| 2 | HPLC | HALL TRANSPORTATION LLC | | | SCAC4 |
| 3 | HPLD | HURON PRODUCE LTD | | | SCAC4 |
| 4 | HPLF | HIGHLAND PROJECTS LLC | | | SCAC4 |
| 5 | HPLG | HELP LOGISTICS INC | | | SCAC4 |
| 6 | HPLH | HOLE PRODUCTIONS LTD, THE | | | SCAC4 |
| 7 | HPLI | HI-PLAINS LEASING INC | | | SCAC4 |
| 8 | HPLL | HOMEFIRE PREST LOGS LTD | | | SCAC4 |
| 9 | HPLM | HOPE LINE LOGISTICS LLC | | | SCAC4 |
| 10 | HPLO | HOOPS LOGISTICS LLC | | | SCAC4 |
| 11 | HPLQ | HIGH POINT LOGISTICS INC | | | SCAC4 |
| 12 | HPLS | HIGH PLAINS LOWBED SERVICE | | | SCAC4 |
| 13 | HPLT | HIGH PLAINS OUTFITTERS | | | SCAC4 |
| 14 | HPLX | Exxon Mobil Corp. | added 7/2000; 7/2005 | | NAKINA |
| 15 | HPLX | Exxon Co., U.S.A. | added 1/1977; 1/1980; 1/1994; eliminated 7/2000 | | NAKINA |
| 16 | HPLX | Exxon Pipeline Co. | added 1/1973; 1/1975; eliminated 1/1977 | | NAKINA |
| 17 | HPLX | Humble Pipe Line Co. | added 1/1967; 4/1970; eliminated 1/1973 | | NAKINA |
| 18 | HPLX | Hyman Pickle Co. | 7/1923 | | NAKINA |
| 19 | HPLX | Humble Pipe Line Co. | added 1/67; 4/70 | | NRHS |
| 20 | HPLX | Exxon Pipeline Co. | 1/75; eliminated 1/77 | | NRHS |
| 21 | HPLX | Exxon Co., U.S.A. | added 1/77; 1/80; 1/94; eliminated 7/2000 | | NRHS |
| 22 | HPLX | Exxon Mobil Corp. | added 7/2000 | | NRHS |
| 23 | HPLX | *HYMAN PICKLE CO. | | | PWRC |
| 24 | HPLX | +EXXON-MOBIL CORP. [EXXON USA CORP.; EXXON PIPELINE CO.; HUMBLE PIPE LINE CO.] | | | PWRC |
| 25 | HPLX | Humble Pipe Line (Exxon-Mobil Corporation) | | | RSRV |
| 26 | HPLX | EXXON MOBIL CORPORATION | | | SCAC4 |
| 27 | HPLY | HEMPERLEY TRANSPORTATION SERVICES I | | | SCAC4 |
