| 1 | MEL | BAe Civil Division Warton | Callsign: Minstrel, | GB | AVCODES |
| 2 | MEL | Mega Linhas Aereas | | | ICAO1 |
| 3 | MEL | Museums-Eisenbahn-Club Losheim | | DE | VKM |
| 4 | MELA | MELANSON TRANSPORTATION INC | | | SCAC4 |
| 5 | MELA | Mela-Reisen | | D | TRAFFIC |
| 6 | MELB | MELBURN TRUCK LINES INC | | | SCAC4 |
| 7 | MELC | MELROSE TRANSPORT SYSTEMS, INC | | | SCAC1 |
| 8 | MELC | MELROSE TRANSPORT SYSTEMS INC | | | SCAC4 |
| 9 | MELD | MELHORN, TIM TRUCKING LLC | | | SCAC4 |
| 10 | MELE | MCGILLS ENT LTD | | | SCAC4 |
| 11 | MELI | MELCARM INC | | | SCAC4 |
| 12 | MELJ | MJM EXPRESS LLC | | | SCAC4 |
| 13 | MELL | MELLOTT TRANSPORT INC | | | SCAC4 |
| 14 | MELM | M E L MARITIME GMBH | | | SCAC4 |
| 15 | MELO | MTRANS ENTERPRISES LTD | | | SCAC4 |
| 16 | MELP | M & E BALTIC TRANSPORTATION LLC | | | SCAC4 |
| 17 | MELR | MELENDREZ, A TRUCKING | | | SCAC4 |
| 18 | MELS | MEL & SONS OIL SALES INC | | | SCAC4 |
| 19 | MELT | MEL & SONS TRUCKING CORP | | | SCAC4 |
| 20 | MELU | JORN BOLDING A/S | | DK | BIC |
| 21 | MELU | MESSER GREISHEIM GMBH | | | SCAC4 |
| 22 | MELX | Sunbelt Cement, Inc. | added 4/1991; eliminated 7/1991; 1/1994 (not listed); 7/2000 (not listed); added 10/2000; eliminated 10/2002 | | NAKINA |
| 23 | MELX | Melwire Inc. | added 10/1985; eliminated 4/1991 | | NAKINA |
| 24 | MELX | Milwaukee Electric Ry. & Light Co. | 8/1920 | | NAKINA |
| 25 | MELX | Melwire Inc. | eliminated 4/91 | | NRHS |
| 26 | MELX | Sunbelt Cement, Inc. | added 4/91; eliminated 7/91; 1/94-7/2000; added 10/2000 | | NRHS |
| 27 | MELX | *MILWAUKEE ELECTRIC RWY. & LIGHT CO. | | | PWRC |
| 28 | MELX | *MELWIRE INC. | | | PWRC |
| 29 | MELX | *SUNBELT CEMENT, INC. | | | PWRC |
| 30 | MELX | Melwire Inc. (Sunbelt Cement) | | | RSRV |
| 31 | MELZ | MILLIGAN ELEVATOR | | | PWRC |
