| 1 | HIL | Skyways Regional AB | IATA: HS, Callsign: Highland, Name changed to Svenska Direcktflyg AB. Name changed from Highland Air AB | S | AVCODES |
| 2 | HIL | Highland Air AB | IATA: HS, Callsign: Highland, Name changed to Skyways Regional AB | S | AVCODES |
| 3 | HIL | Svenska Direktflyg AB | IATA: HS, Callsign: Highland, ICAO designator changed to SKH, ICAO callsign changed to Skyreg. Name changed from Skyways Regional AB | S | AVCODES |
| 4 | HILC | HILL TRANSPORT INC | | | SCAC4 |
| 5 | HILF | HILITE SEAFOOD | | | SCAC4 |
| 6 | HILH | HORIZON INT'L SHIPPING INC | | | SCAC4 |
| 7 | HILI | HI-LINE TRANSFER AND STORAGE INCORP | | | SCAC4 |
| 8 | HILJ | HILL, JAMES P INC | | | SCAC4 |
| 9 | HILLSIDE | 22 Hillside | | USA | TRAFFIC |
| 10 | HILM | HI-LITE MARKINGS INC | | | SCAC4 |
| 11 | HILN | HORIZON INTERNATIONAL LINES | | | SCAC4 |
| 12 | HILP | HILLTOP OIL COMPANY INC | | | SCAC4 |
| 13 | HILS | HILL TRANSPORTATION CO | | | PWRC |
| 14 | HILU | HILLSTONE HOLDING B.V. | | NL | BIC |
| 15 | HILV | HILL TRANSPORTATION SERVICE INC | | | SCAC4 |
| 16 | HILX | Hillman Coal & Coke Co. | 7/1923 | | NAKINA |
| 17 | HILX | *HILLMAN COAL & COKE CO. | | | PWRC |
| 18 | HILX | +HILLIARD INVESTMENT, LLC | | | PWRC |
| 19 | HILX | HILLIARD INVESTMENTS LLC | | | SCAC4 |
