| 5301 | SJHL | ST JOHN HAULING LLC | | | SCAC4 |
| 5302 | SJHP | STOOPS, JOHN P | | | SCAC4 |
| 5303 | SJHS | SEALE, J H & SON INC | | | SCAC4 |
| 5304 | SJHT | SANJAN HOT SHOT AND TRANSPORT | | | SCAC4 |
| 5305 | SJIA | S & J INTERMODAL AND LOGISTICS LLC | | | SCAC4 |
| 5306 | SJIC | SANDERS, JIMMY INC | | | SCAC4 |
| 5307 | SJIU | PT. SINARJAYA INTIMPERKASA | | RI | BIC |
| 5308 | SJJ | Spirit Aviation, Inc. | Callsign: Spirit Jet, Name change to Spirit Jets, LLC | USA | AVCODES |
| 5309 | SJJ | Spirit Jets, LLC | Callsign: Spirit Jet, Name change from Spirit Aviation, Inc. | USA | AVCODES |
| 5310 | SJJ | Spirit Aviation | | | ICAO1 |
| 5311 | SJJI | SULLIVAN, J J | | | SCAC4 |
| 5312 | SJJK | SAUTER, J J TRUCKING INC | | | SCAC4 |
| 5313 | SJK | Nusantara Air Charter, PT. | Callsign: Nusantara, | RI | AVCODES |
| 5314 | SJKC | SILJA TRUCKING | | | SCAC4 |
| 5315 | SJKE | SONDERJYSK ERHVERVSINVESTERING K/S- | | | SCAC4 |
| 5316 | SJKI | S & J TRUCKING INC | | | SCAC4 |
| 5317 | SJKL | SATRAJ TRUCKING LLC | | | SCAC4 |
| 5318 | SJKN | STOCK, JEFF TRUCKING INC | | | SCAC4 |
| 5319 | SJKQ | ST JOHN KNITS INC | | | SCAC4 |
| 5320 | SJKS | SAJACKS TRANSPORT INC | | | SCAC4 |
| 5321 | SJKU | SARJAK CONTAINER LINES PVT LTD | | IND | BIC |
| 5322 | SJL | Servicios Especiales del Pacifico Jalisco S.A. de C.V. | Callsign: Servicios Jalisco, | MEX | AVCODES |
| 5323 | SJL | SkyJet | Callsign: Kamila, | KS | AVCODES |
| 5324 | SJL | Servicios Especiales Del Pacifico Jalisco | | | ICAO1 |
| 5325 | SJL | St. Johnsbury & Lamoille County R.R. | 4/1961-4/1970; eliminated 11/1973; added 4/1974; 1/1975; eliminated 7/1977 | | NAKINA |
| 5326 | SJL | Vermont Northern R.R. Co. | added 1/1978; eliminated 4/1978 | | NAKINA |
| 5327 | SJL | St. Johnsbury & Lamoille County R.R. | 4/61-4/70; eliminated 11/73; added 4/74; 1/75; eliminated 7/77 | | NRHS |
| 5328 | SJL | Vermont Northern R.R. Co. | added 1/78; eliminated 4/78 | | NRHS |
| 5329 | SJL | VERMONT NORTHERN RAILROAD CO. [St. JOHNSBURY & LAMOILLE COUNTY RAILROAD] | | | PWRC |
| 5330 | SJLI | S & J LOGISTICS INC | | | SCAC4 |
| 5331 | SJLK | SOUTHARD, J L TRUCKING INC | | | SCAC4 |
| 5332 | SJLN | SHADD, JOH | | | SCAC4 |
| 5333 | SJLP | SHANDY, J L TRANSPORTATION INC | | | SCAC4 |
| 5334 | SJLR | SLABACH, J L TRUCKING | | | SCAC4 |
| 5335 | SJLX | St. Joseph Lead Co. | added 4/1958; 4/1961-4/1970; eliminated 10/1970 (reporting marks changed to SJMX) | | NAKINA |
| 5336 | SJLX | St. Joseph Lead Co. | 4/61-4/70; eliminated 10/70 (reporting marks changed to SJMX) | | NRHS |
| 5337 | SJLX | ST. JOSEPH LEAD CO. | | | PWRC |
| 5338 | SJLZ | ST. JOSEPH LEAD CO. | | | PWRC |
| 5339 | SJM | Southern Air Transport, Inc. | IATA: SJ, Callsign: Southern Air, Ceased operations | USA | AVCODES |
| 5340 | SJM | Sino Jet Management Limited | Callsign: Sino Sky, | PRC | AVCODES |
| 5341 | SJMA | SOJOURN MARINE | | | SCAC4 |
| 5342 | SJMM | SCOTT, JOHN | | | SCAC4 |
| 5343 | SJMN | SALINAS, JUAN MANUEL | | | SCAC4 |
| 5344 | SJMX | St. Joe Minerals Corp. (name changed to Zinc Corp. of America, reporting marks to ZCAX) | added 10/1970; 1/1975-1/1980; eliminated 10/1988 | | NAKINA |
| 5345 | SJMX | St. Joe Minerals Corp. (name changed to Zinc Corp. of America, reporting marks to ZCAX) | added 10/70; 1/75-1/80; eliminated 10/88 | | NRHS |
| 5346 | SJMX | ST. JOE MINERALS CORP. (NAME CHANGED TO ZINC CORP. OF AMERICA, MARK CHANGED TO ZCAX) | | | PWRC |
| 5347 | SJMX | St. Joe Minerals Corporation | | | RSRV |
| 5348 | SJMZ | ST. JOE'S MINE | | | PWRC |
| 5349 | SJN | Chartair, Inc. d/b/a Air San Juan | Callsign: San Juan, Name changed to Rugby Aviation, LLC d/b/a Air San Juan | USA | AVCODES |
| 5350 | SJN | Chartair, Inc. d/b/a Air San Juan | IATA: 5W, Callsign: San Juan, Designator recalled by IATA | USA | AVCODES |
| 5351 | SJN | Sajen Air, Inc. | Callsign: Sajen, | USA | AVCODES |
| 5352 | SJN | Rugby Aviation, LLC d/b/a San Juan Airlines | Callsign: San Juan, Name changed from Chartair, Inc. d/b/a Air San Juan. | USA | AVCODES |
| 5353 | SJN | Air San Juan | | | ICAO1 |
| 5354 | SJNG | SAN JUAN NAVIGATION CORP | | | SCAC4 |
| 5355 | SJNI | SUNJIN SHIPPING (U S A) INC | | | SCAC4 |
| 5356 | SJNO | SJ Norge AS | City: In June 2020 SJ (from Sweden) took over all operations north of Oslo from Vy (former NSB). This involves the services on Oslo-Trondheim, Trondheim-Bodo, Dombas-Andalsnes, Hamar-Roros-Trondheim, Trondheim-Storlien(-Sundsvall) and local trains around Trondheim and Bodo. The concession will run for 8 years, with options for another 2 years. | N | TRAFFIC |
| 5357 | SJNR | STEPHENSON, JOHN RICHARD | | | SCAC4 |
| 5358 | SJNS | SAN JUAN NAVIGATION (SINGAPORE) PTE | | | SCAC4 |
| 5359 | SJNX | Mobay Corp. | 1/1994-7/2005 (not listed) | | NAKINA |
| 5360 | SJNX | Mobay Corp. | 1/94-7/2000 | | NRHS |
| 5361 | SJNX | MOBAY CORPORATION | | | PWRC |
| 5362 | SJNX | Mobay Corporation | | | RSRV |
| 5363 | SJNX | MOBAY CORPORATION | | | SCAC4 |
| 5364 | SJO | Spring Airlines Japan Co. Ltd. | IATA: IJ, Callsign: Jey Spring, Name changed to Spring Japan Co., Ltd. | J | AVCODES |
| 5365 | SJO | Spring Japan Co. Ltd. | IATA: IJ, Callsign: Jey Spring, Name changed from Spring Airlines Japan Co. Ltd. | J | AVCODES |
| 5366 | SJO | Spring Airlines Japan | | J | TRAFFIC |
| 5367 | SJOE | SAN JOAQUIN VALLEY EXPRESS | | | SCAC4 |
| 5368 | SJON | SLACK, JOHN | | | SCAC4 |
| 5369 | SJOW | STENGER, J W TRUCKING INC | | | SCAC4 |
| 5370 | SJPC | ST JOE PETROLEUM CO | | | SCAC4 |
| 5371 | SJPD | SUJAJA ENTERPRISE LTD | | | SCAC4 |
| 5372 | SJPE | SJP ENTERPRISES INC | | | SCAC4 |
| 5373 | SJPH | SHULMAN, JERRY PRODUCE SHIPPER INC | | | SCAC4 |
| 5374 | SJPO | SAN JUAN POOLS | | | SCAC4 |
| 5375 | SJPP | SMITH, JAMES R TRUCKING CO INC | | | SCAC4 |
| 5376 | SJPR | S&J TRANSPORTATION | | | SCAC1 |
| 5377 | SJPR | S & J TRANSPORTATION | | | SCAC4 |
| 5378 | SJPU | MODULAR TANKING SOLUTIONS MAURITIUS LTD | | MUS | BIC |
| 5379 | SJRT | St. Johns River Terminal | 1/1975-7/2005 | | NAKINA |
| 5380 | SJRT | St. Johns River Terminal | 1/75-7/2000 | | NRHS |
| 5381 | SJRT | NORFOLK SOUTHERN RAILWAY [(SOU) ST. JOHNS RIVER TERMINAL] | | | PWRC |
| 5382 | SJRT | St. Johns River Terminal | | | RSRV |
| 5383 | SJRU | CRYSTAL CLEAR ELECTRONIC MATERIAL CO,LTD | | PRC | BIC |
| 5384 | SJRU | SUZHOU CRYSTAL CLEAR CHEMICAL CO LT | | | SCAC4 |
| 5385 | SJRX | Jacksonville Electric Authority | added 10/1986; 1/1994; eliminated 1/1995; 7/2000-7/2005 (not listed) | | NAKINA |
| 5386 | SJRX | Jacksonville Electric Authority | added 10/86; 1/94; eliminated 1/95; 7/2000 | | NRHS |
| 5387 | SJRX | *FLORIDA POWER (ST. JOHNS RIVER GENERATING PLANT) | | | PWRC |
| 5388 | SJRX | +JACKSONVILLE ELECTRIC AUTHORITY | | | PWRC |
| 5389 | SJRX | Jacksonville Electric Authority | | | RSRV |
| 5390 | SJRX | JACKSONVILLE ELECTRIC AUTHORITY | | | SCAC4 |
| 5391 | SJS | Skyjets & Support, S.A. de C.V. | Callsign: Jet Port, | MEX | AVCODES |
| 5392 | SJS | Det Sjællandske Jernbaneselskab | 1847 - 1893 | DK | jernbanen.dk |
| 5393 | SJS | Det Sjællandske Jernbaneselskab | 1848 - 1893 | DK | TRAFFIC |
| 5394 | SJSC | ST JOHNS SHIPPING CO INC | | | SCAC4 |
| 5395 | SJSD | S J S TRUCKING INC | | | SCAC4 |
| 5396 | SJSE | SAN JUAN STAR EXPRESS LLC | | | SCAC4 |
| 5397 | SJSH | S J S INC | | | SCAC4 |
| 5398 | SJSK | SAINT JOHN SPRINGWORKS LTD | | | SCAC4 |
| 5399 | SJSM | SELECT JERSEY SENC | | | SCAC4 |
| 5400 | SJSU | CHENGDU SJIUS CROSS-BORDER E-COMMERCE CO., LTD. | | PRC | BIC |
