| 1 | MOD | Modiluft Limited | IATA: HT, Callsign: Modiluft, IATA Prefix: 548, Ceased operations in 1996. AOC transferred to Royal Airways t/a SpiceJet | IND | AVCODES |
| 2 | MOD | Royal Airlines Limited | IATA: 0S, Callsign: Modiluft, Name changed to Royal Airlines Limited d/b/a Spice Jet | IND | AVCODES |
| 3 | MOD | Royal Airlines Limited d/b/a Spice Jet | IATA: 0S, Callsign: Modiluft, Name changed from Royal Airlines Limited. IATA designator changed to SG. | IND | AVCODES |
| 4 | MOD | Royal Airlines Limited d/b/a Spice Jet | IATA: SG, Callsign: Modiluft, ICAO designator changed to SEJ. ICAO callsign changed to Spicejet. Name changed from Royal Airlines Limited. IATA designator changed from 0S. | IND | AVCODES |
| 5 | MOD | Aeroclube de Coimbra | Callsign: Mondego, | P | AVCODES |
| 6 | MOD | Missouri Pacific System | eliminated 10/1981; eliminated 5/1983 | | NAKINA |
| 7 | MOD | Missouri Pacific Railroad Co. | added 1/1977; 1/1980 | | NAKINA |
| 8 | MOD | Texas and Pacific Railway Co. | 1/1975; eliminated 1/1977 | | NAKINA |
| 9 | MOD | Texas and Pacific Railway Co. | 1/75; eliminated 1/77 | | NRHS |
| 10 | MOD | Missouri Pacific Railroad Co. | added 1/77; 1/80 | | NRHS |
| 11 | MOD | Missouri Pacific System | eliminated 10/81; eliminated 5/83 | | NRHS |
| 12 | MOD | UNION PACIFIC [MISSOURI PACIFIC SYSTEM; TEXAS & PACIFIC RWY. CO.] | | | PWRC |
| 13 | MOD | Missouri Pacific Railroad | | | RSRV |
| 14 | MODE | MODESTI BROS | | | SCAC1 |
| 15 | MODE | MODESTI BROS INC | | | SCAC4 |
| 16 | MODF | MOLINA TRANSPORTATION | | | SCAC4 |
| 17 | MODH | MONTGOMERY OIL INC | | | SCAC4 |
| 18 | MODJ | MODULEULTRA | | | SCAC4 |
| 19 | MODK | MODE TRUCKING LLC | | | SCAC4 |
| 20 | MODM | MORALES, D | | | SCAC4 |
| 21 | MODN | MODELO TRANSPORT LLC | | | SCAC4 |
| 22 | MODP | MOLD EXPRESS | | | SCAC4 |
| 23 | MODR | MODAR TRANSPORT INC | | | SCAC4 |
| 24 | MODS | MOLD-SPEC INC | | | SCAC4 |
| 25 | MODT | MOSTAR DIRECTIONAL TECHNOLOGIES INC | | | SCAC4 |
| 26 | MODU | MODUL LTD | | RUS | BIC |
| 27 | MODU | MODUL LTD | | | SCAC4 |
| 28 | MODV | MORSE, DAVID TRUCKING LLC | | | SCAC4 |
| 29 | MODX | American Refrigerator Transit Co. | added 7/1955; 10/1957-1/1975; eliminated 7/1977 | | NAKINA |
| 30 | MODX | American Refrigerator Transit Co. | added 7/55; 10/57-1/75; eliminated 7/77 | | NRHS |
| 31 | MODX | AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 32 | MODY | MOYER TRANSPORT INC | | | SCAC4 |
