| 1 | HYC | Hydro Air (PTY) Ltd. | Callsign: Hydro Cargo, | ZA | AVCODES |
| 2 | HYC | Hydro Air Flight Operations | | | ICAO1 |
| 3 | HYCB | HYMARK EXPRESS INC | | | SCAC4 |
| 4 | HYCC | HAPPY YELLOW CHECKER CAB | | | SCAC4 |
| 5 | HYCD | HAYCOCK DISTRIBUTING CO INC | | | SCAC4 |
| 6 | HYCI | HAY, CLIFFORD C INC | | | SCAC4 |
| 7 | HYCK | HAY CREEK EXPRESS INC | | | SCAC4 |
| 8 | HYCM | HYDRO CHEM INDUSTRIAL SERVICES INC | | | SCAC4 |
| 9 | HYCO | HUSKEY BUS & TRANSPORTATION SERVICE | | | SCAC4 |
| 10 | HYCQ | HOMETOWN ENERGY LLC | | | SCAC4 |
| 11 | HYCT | HUNEYCUTT TRANSPORT | | | SCAC4 |
| 12 | HYCW | HAYWORTH, C & V TRUCKING CO | | | SCAC4 |
