| 1 | MHS | Air Memphis | Callsign: Air Memphis, | ET | AVCODES |
| 2 | MHS | Air Memphis | | | ICAO1 |
| 3 | MHSA | MASTHEAD SHIPPING SA | | | SCAC4 |
| 4 | MHSB | MH SHIPPING INC | | | SCAC4 |
| 5 | MHSF | Morehead & South Fork R.R. Co., Inc. | added 7/2008; eliminated 10/2008 | | NAKINA |
| 6 | MHSF | MOREHEAD & SOUTH FORK RAILROAD CO., INC. | | | PWRC |
| 7 | MHSF | MOREHEAD & SOUTH FORK RAILROAD CO I | | | SCAC4 |
| 8 | MHSH | MYTRAK HEALTH SYSTEM INC | | | SCAC4 |
| 9 | MHSI | MOOSELY HOTSHOT SERVICES INC | | | SCAC4 |
| 10 | MHSK | MOBILE HOME SERVICE & TRANSPORTING | | | SCAC4 |
| 11 | MHSL | MATERIAL HANDLING SOURCE | | | SCAC4 |
| 12 | MHSQ | MATHIS TRUCKING | | | SCAC4 |
| 13 | MHSS | MARLETT HOT SHOT SERVICE | | | SCAC4 |
| 14 | MHST | MESHOPPE | | | SCAC4 |
| 15 | MHSW | MONARCH HOT SHOT | | | SCAC4 |
| 16 | MHSX | Midvale-Heppenstall Co. | added 10/1965; 10/1966-4/1970; eliminated 1/1971 | | NAKINA |
| 17 | MHSX | Midvale-Heppenstall Co. | added 10/65; 10/66-4/70; eliminated 1/71 | | NRHS |
| 18 | MHSX | MID-VALE HEPPENSTALL CO. | | | PWRC |
