| 1 | MBL | First City Air Plc | Callsign: First City, | GB | AVCODES |
| 2 | MBL | First City Air | | | ICAO1 |
| 3 | MBLD | MELTON, BOB TRUCK SERVICE LOGISTICS | | | SCAC4 |
| 4 | MBLE | MOBILE AIR TRANSPORT | | | SCAC4 |
| 5 | MBLG | MAYBANK LOGISTICS MANAGEMENT LLC | | | SCAC4 |
| 6 | MBLH | MARBLEHEAD TRADING COMPANY INC | | | SCAC4 |
| 7 | MBLI | MR BULTS INC | | | SCAC4 |
| 8 | MBLJ | MICHIGANTRUCK BROKERAGE LLC | | | SCAC4 |
| 9 | MBLM | M B LOGISTIC | | | SCAC4 |
| 10 | MBLO | MINOR BAY LODGE AND OUTPOSTS LTD | | | SCAC4 |
| 11 | MBLU | MAR BRIDGE LINE INC. | | PA | BIC |
| 12 | MBLU | MARBARAL INVESTMENTS PTY LTD | | | SCAC4 |
| 13 | MBLV | METRO, BLAIR | | | SCAC4 |
| 14 | MBLX | Exxon Mobil Corp. | added 7/2000; 7/2000-7/2005 | | NAKINA |
| 15 | MBLX | Mobil Oil Corp. | added 1/1995; eliminated 7/2000 | | NAKINA |
| 16 | MBLX | McColl Brothers Ltd. (McColl-Frontenac Oil Co., Ltd.) | 7/1930-7/1932 | | NAKINA |
| 17 | MBLX | Mobil Oil Corp. | added 1/95; eliminated 7/2000 | | NRHS |
| 18 | MBLX | Exxon Mobil Corp. | added 7/2000; 7/2000 | | NRHS |
| 19 | MBLX | *MCCOLL-FRONTENAC OIL CO., LTD. [MCCOLL BROTHERS LTD.] | | | PWRC |
| 20 | MBLX | *MUNICIPAL BELT LINE | | | PWRC |
| 21 | MBLX | +EXXON MOBIL CORP. [MOBIL OIL CORPORATION] | | | PWRC |
| 22 | MBLX | McColl Brothers Ltd. (Exxon-Mobil Corporation) | | | RSRV |
| 23 | MBLX | EXXON MOBIL CORPORATION | | | SCAC4 |
| 24 | MBLY | MABEYS MOVING & STORAGE INC | | | SCAC4 |
