| 1 | MUC | Air Munich Aviation AG | Callsign: Air Munich, | D | AVCODES |
| 2 | MUCC | MUCCI, PIETRO INC | | | SCAC4 |
| 3 | MUCI | MOUNT CITY TRUCKING INC | | | SCAC4 |
| 4 | MUCN | M & A TRUCKING | | | SCAC4 |
| 5 | MUCO | MOULTRIE TRANSPORTATION | | | SCAC4 |
| 6 | MUCR | MILLENIUM TRANSPORTATION & LOGISTIC | | | SCAC4 |
| 7 | MUCS | MANUFACTURERS CONSOLIDATION SERVICES, INC. | | | SCAC1 |
| 8 | MUCS | MATHIEU, JOCELYN TRANSIT | | | SCAC4 |
| 9 | MUCU | G.T.S SPA | | I | BIC |
| 10 | MUCU | G T S SRL | | | SCAC4 |
| 11 | MUCX | Murro Chemical Co., Inc. | 7/1965-1/1975; eliminated 7/1976; eliminated 10/1978 | | NAKINA |
| 12 | MUCX | Murro Chemical Co., Inc. | 7/65-1/75; eliminated 7/76; eliminated 10/78 | | NRHS |
| 13 | MUCX | MURRO CHEMICAL CO. | | | PWRC |
| 14 | MUCZ | MURPHY COMPANY | | | PWRC |
