| 1 | SMM | Summit Airlines | Callsign: Summit-Air, Founded in 1966. Ceased operations in 1988 | USA | AVCODES |
| 2 | SMM | Summit Airlines | | | ICAO1 |
| 3 | SMMA | SUMM | | | SCAC4 |
| 4 | SMMB | SEAMA | | | SCAC4 |
| 5 | SMMBL | Santa Monica Municipal Bus Lines | | US-CA | TRAFFIC |
| 6 | SMME | ST MICHAEL MOTOR EXPRESS INC | | | SCAC4 |
| 7 | SMMF | SOUTHEASTERN METALS MANUFACTURING C | | | SCAC4 |
| 8 | SMMH | SUN MARINE MAINTENANCE INC | | | SCAC4 |
| 9 | SMMJ | SANDOVA | | | SCAC4 |
| 10 | SMML | SAN MORITZ MARIITME LTD | | | SCAC4 |
| 11 | SMMP | STAR MARITIME PTE LTD | | | SCAC4 |
| 12 | SMMQ | SMET MONUMENTS | | | SCAC4 |
| 13 | SMMR | SOMME | | | SCAC4 |
| 14 | SMMT | SUMMITT TRUCKING LLC | | | SCAC4 |
| 15 | SMMU | SC SPEZIAL MONTAGEN SRL | | RO | BIC |
| 16 | SMMV | SMITH MOVERS, INC. | | | SCAC1 |
| 17 | SMMV | SMITH MOVERS | | | SCAC4 |
| 18 | SMMW | SWIFT & MCCORMICK METAL PROCESSORS | | | SCAC4 |
| 19 | SMMX | St. Marys Cement Co. | 1/1994-7/2000 (not listed) | | NAKINA |
| 20 | SMMX | St. Marys Cement Inc. (US) | added 10/2001; 7/2005 | | NAKINA |
| 21 | SMMX | St. Marys Cement Co. | 1/94-7/2000 | | NRHS |
| 22 | SMMX | ST. MARYS CEMENT INC. (US) | | | PWRC |
| 23 | SMMX | St. Mary's Cement | | | RSRV |
| 24 | SMMX | ST MARYS CEMENT INC (US) | | | SCAC4 |
| 25 | SMMY | SUMM | | | SCAC4 |
