| 1 | SNX | Sun Air Aviation Services | Callsign: Sunex, | CDN | AVCODES |
| 2 | SNX | Nordic Commercial Holding AB | Callsign: Snowflake, Name changed to Air Sweden Aviation AB | S | AVCODES |
| 3 | SNX | Air Sweden Aviation AB | Callsign: Snowflake, Ceased operations during September 2011. Name changed from Nordic Commercial Holding AB | S | AVCODES |
| 4 | SNX | Sun Air Aviation Services | | | ICAO1 |
| 5 | SNX | Sun Gasoline Co. | 7/1923 | | NAKINA |
| 6 | SNX | National Car Co. | 1/1950-7/1965 & 4/1970; eliminated 7/1970 | | NAKINA |
| 7 | SNX | Stadler's Packing Co., Columbus, Ind. (National Car Co.) | 10/1966 | | NAKINA |
| 8 | SNX | National Car Co. | 1/52-7/65 & 4/70; eliminated 7/70 | | NRHS |
| 9 | SNX | Stadler's Packing Co., Columbus, Ind. (National Car Co.) | Oct-66 | | NRHS |
| 10 | SNX | *SUN GASOLINE CO. | | | PWRC |
| 11 | SNX | *STADLER'S PACKING CO. (NCCO) | | | PWRC |
| 12 | SNXC | SANTEX CORPORATION | | | SCAC4 |
| 13 | SNXE | SUN EXPRESS TRANSPORT INC | | | SCAC4 |
| 14 | SNXF | S & N TRANSPORT LLC | | | SCAC4 |
| 15 | SNXG | SAHAN EXPRESS LLC | | | SCAC4 |
| 16 | SNXH | SNR TRANSPORTATION | | | SCAC4 |
| 17 | SNXI | STANDEX INTERNATIONAL CORP | | | SCAC4 |
| 18 | SNXK | SALSON TRANSPORTATION SERVICES INC | | | SCAC4 |
| 19 | SNXL | SOONEX LOGISTICS INC | | | SCAC4 |
| 20 | SNXM | SAN MARINO TRANSPORTATION INC | | | SCAC4 |
| 21 | SNXN | SANEXEN ENVIRONMENTAL SERVICES INC | | | SCAC4 |
| 22 | SNXO | SOUTHERN TRANSPORT | | | SCAC4 |
| 23 | SNXQ | SONIC EXPRESS | | | SCAC4 |
| 24 | SNXR | SOMNER EXPRESS INC | | | SCAC4 |
| 25 | SNXV | SANTI EXPRESS INC | | | SCAC4 |
