| 1 | MCD | Air Medical Ltd. | Callsign: Air Med, Ceased operations on 01 February 2016. | GB | AVCODES |
| 2 | MCD | Air Medical | | | ICAO1 |
| 3 | MCDA | MCD TRANSPORTATION INC S DE RL | | | SCAC4 |
| 4 | MCDC | MCD AIR TRANSPORT INC | | | SCAC4 |
| 5 | MCDE | MCDANIEL TRUCKING | | | SCAC4 |
| 6 | MCDG | MULTI-CAST DESIGN INC | | | SCAC4 |
| 7 | MCDH | MCDONOUGHS STABLES | | | SCAC4 |
| 8 | MCDJ | MCCABE, D J INC | | | SCAC4 |
| 9 | MCDL | MCCLAIN DRAY LINE INC | | | PWRC |
| 10 | MCDL | MACDONALD, EARL & SON TRANSPORT LIM | | | SCAC4 |
| 11 | MCDM | MULTI CARGO TRUCKING INC | | | SCAC4 |
| 12 | MCDN | MADISON CHEMICAL INDUSTRIES INC | | | SCAC4 |
| 13 | MCDO | MCDONNALL TRANSPORT LLC | | | SCAC4 |
| 14 | MCDR | MILLARS CEDAR POSTS LIMITED | | | SCAC4 |
| 15 | MCDS | MCD TRANSPORTATION INC | | | SCAC4 |
| 16 | MCDT | MICHIGAN DEPARTMENT OF TRANSPORTATION | | | PWRC |
| 17 | MCDT | MCADEN DAIRY TRUCKING INC | | | SCAC4 |
| 18 | MCDU | MAKHTESHIM DAROM (RAMAT HOVAV), LTD | | | SCAC4 |
| 19 | MCDW | MCDOUGALL, WALTER INTERNATIONAL LOG | | | SCAC4 |
| 20 | MCDX | Sunbelt Cement, Inc. | added 7/1991; 1/1994-7/2000; eliminated 10/2002 | | NAKINA |
| 21 | MCDX | Cementos Mexicanos, S.A. | added 4/1989; eliminated 7/1991 | | NAKINA |
| 22 | MCDX | Redland Worth Corp. | added 10/1983; eliminated 4/1986 | | NAKINA |
| 23 | MCDX | McDonough Brothers, Inc. | added 7/1978; 1/1980; eliminated 10/1983 | | NAKINA |
| 24 | MCDX | McDonough Brothers, Inc. | added 7/78; 1/80; eliminated 10/83 | | NRHS |
| 25 | MCDX | Redland Worth Corp. | added 10/83; eliminated 4/86 | | NRHS |
| 26 | MCDX | Cementos Mexicanos, S.A. | added 4/89; eliminated 7/91 | | NRHS |
| 27 | MCDX | Sunbelt Cement, Inc. | added 7/91; 1/94-7/2000 | | NRHS |
| 28 | MCDX | *REDLAND WORTH CORP. [MCDONOUGH BROTHERS, INC.] | | | PWRC |
| 29 | MCDX | *(MELX) SUNBELT CEMENT, INC. [CEMENTOS MEXICANOS, SA] | | | PWRC |
| 30 | MCDX | Redland Worth Corporation (Sunbelt Cement) | | | RSRV |
| 31 | MCDY | MIAMI CRATING & DELIVERY | | | SCAC4 |
