| 1 | MDL | Mandala Airlines, PT. t/a Tigerair Mandala | IATA: RI, Callsign: Mandala, Ceased operations on 01 July 2014. Designator RI reinstated by IATA. IATA designator changed from RI*. Name changed from PT. Mandala Airlines in 2010. Founded on 17 April 1969. | RI | AVCODES |
| 2 | MDL | Mandala Airlines | IATA: RI, Callsign: Mandala, IATA designator changed to RI. Name changed from PT. Mandala Airlines | RI | AVCODES |
| 3 | MDL | Mandala Airlines | IATA: RI, Callsign: Mandala, Name changed from PT. Mandala Airlines. Designator RI* reinstated by IATA | RI | AVCODES |
| 4 | MDL | PT. Mandala Airlines | IATA: RI, Callsign: Mandala, Name changed to Mandala Airlines. Designator RI* reinstated by IATA | RI | AVCODES |
| 5 | MDL | Mandala Airlines | IATA: RI | | ICAO1 |
| 6 | MDLC | MERCURY DIRECT LOGISTICS LLC | | | SCAC4 |
| 7 | MDLD | MIDLAND TRANSPORT LIMITED | | | SCAC1 |
| 8 | MDLD | MIDLAND TRANSPORT LIMITED | | | SCAC4 |
| 9 | MDLF | MIDLAND FREIGHT SYSTEMS INC | | | SCAC4 |
| 10 | MDLJ | MOJACK DISTRIBUTORS LLC | | | SCAC4 |
| 11 | MDLK | MCALLISTER, DON LLC | | | SCAC4 |
| 12 | MDLN | MAHURIN-DUVALL LINES INC | | | SCAC4 |
| 13 | MDLQ | MAR-DALE TRANSPORT (1985) LTD | | | SCAC4 |
| 14 | MDLR | Pennsylvania Southwestern R.R. Inc. | added 10/2003; eliminated 4/2004; added 4/2005; 7/2005 | | NAKINA |
| 15 | MDLR | The Midland Terminal Co. | added 10/1983; 1/1994-7/2000; eliminated 10/2003 | | NAKINA |
| 16 | MDLR | The Midland Terminal Co. | added 10/83; 1/94-7/2000 | | NRHS |
| 17 | MDLR | PENNSYLVANIA SOUTHWESTERN RAILROAD, IMC. [MIDLAND TERMINAL COMPANY] | | | PWRC |
| 18 | MDLR | Midland Terminal | | | RSRV |
| 19 | MDLU | MITSUBISHI GAS CHEMICAL COMPANY INC | | J | BIC |
| 20 | MDLU | MITSUBISHI CORPORATION | | | SCAC4 |
| 21 | MDLV | MARTIN'S FREIGHT SYSTEMS, INC | | | SCAC1 |
| 22 | MDLV | MIDLAND TRANSPORT LIMITED (MICHELIN | | | SCAC4 |
| 23 | MDLW | M D LOGISTICS LLC | | | SCAC4 |
| 24 | MDLY | MIDLAND RESOURCE RECOVERY | | | SCAC4 |
