| 8501 | SPG | Speedwings Executive Jet GmbH | Callsign: Speedwing, Merged into SPARFELL Luftfahrt GmbH after purchase. | A | AVCODES |
| 8502 | SPG | Nordjet Airlines SL | Name changed from Sagolair Transportes Executoves SL. | E | AVCODES |
| 8503 | SPG | Springdale Air Service | | | ICAO1 |
| 8504 | SPGA | STARS & STRIPES TRANSPORTATION | | | SCAC4 |
| 8505 | SPGC | SPRINGFIELD CARTAGE INC | | | SCAC4 |
| 8506 | SPGE | SEA PRESTIGE TRADING CO SA PANAMA | | | SCAC4 |
| 8507 | SPGG | SPRINT TRANSPORTS INC | | | SCAC4 |
| 8508 | SPGI | SPRUNG, TED TRUCKING LLC | | | SCAC4 |
| 8509 | SPGJ | SPRAGUE ENERGY CORPORATION | | | SCAC4 |
| 8510 | SPGK | SPEIGHT, KURT WILLIAM | | | SCAC4 |
| 8511 | SPGK | Sanockie Przedsiêbiorstwo Gospodarki Komunalnej sp. z o.o. | City: Sanok | PL | TRAFFIC |
| 8512 | SPGL | SPERLING INDUSTRIES LTD | | | SCAC4 |
| 8513 | SPGO | SPEEDWAY GAS & OIL CO | | | SCAC4 |
| 8514 | SPGT | SPEC-TEC | | | SCAC4 |
| 8515 | SPGU | OOO SPIKO-GROUP | | RUS | BIC |
| 8516 | SPGU | UNION PACIFIC [SOUTHERN PACIFIC TRANSP CO] | | | PWRC |
| 8517 | SPGV | SUPERIOR CARTAGE INC | | | SCAC4 |
| 8518 | SPGW | SPAULDING, G W TRUCKING CO | | | SCAC4 |
| 8519 | SPGX | Suburban Propane Gas Corp. | 1/1950 | | NAKINA |
| 8520 | SPGX | Suburban Propane—Division of Quantum Chemical Corp. | added 10/1995; eliminated 4/1997 | | NAKINA |
| 8521 | SPGX | Suburban Propane L.P. | added 4/1997; 7/2000-7/2005; eliminated 1/2006 | | NAKINA |
| 8522 | SPGX | Suburban Propane--Division of Quantum Chemical Corp. | added 10/95; eliminated 4/97 | | NRHS |
| 8523 | SPGX | Suburban Propane L.P. | added 4/97; 7/2000 | | NRHS |
| 8524 | SPGX | SUBURBAN PROPANE LP | | | PWRC |
| 8525 | SPGX | Suburban Propane | | | RSRV |
| 8526 | SPH | Sapphire Executive Air | Callsign: Sapphire-Charter, | ZA | AVCODES |
| 8527 | SPH | Sociedade Portuguesa de Helicopteros, Lda. (SPH) | Callsign: Helibeira, | P | AVCODES |
| 8528 | SPH | Sapphire Executive Air | | | ICAO1 |
| 8529 | SPHA | STEPHENSON TRANSPORT INC | | | SCAC4 |
| 8530 | SPHB | SPYCHER BROTHERS | | | SCAC4 |
| 8531 | SPHD | STEPHENSON OIL CO INC | | | SCAC4 |
| 8532 | SPHE | SANDOVAL PEREZ, HECTOR | | | SCAC4 |
| 8533 | SPHG | SAPPHIRE TRANSPORT LLC | | | SCAC4 |
| 8534 | SPHH | SPRUCE HOLLOW HAULAGE INC | | | SCAC4 |
| 8535 | SPHI | SPOKANE HUTTERIAN BRETHREN INC | | | SCAC4 |
| 8536 | SPHM | SEPHORA SHIPPING LIMITED | | | SCAC4 |
| 8537 | SPHO | STEPHENS OIL COMPANY INC | | | SCAC4 |
| 8538 | SPHP | SPECIALIZED HARNESS PRODUCTS | | | SCAC4 |
| 8539 | SPHR | SPHAR, WALTER TRUCKING | | | SCAC4 |
| 8540 | SPHS | SOUCY, PHILIP STUDIOS | | | SCAC4 |
| 8541 | SPHT | SPECHT TRUCKING INC. | | | PWRC |
| 8542 | SPHT | SAPPHIRE TRANSPORTATION INC | | | SCAC4 |
| 8543 | SPHU | SPHB | | REU | BIC |
| 8544 | SPHU | PSHB | | | SCAC4 |
| 8545 | SPHV | SPEARHEAD TRANSPORTATION SERVICES I | | | SCAC4 |
| 8546 | SPHY | SPEEDY HEAVY HAULING INC | | | SCAC4 |
| 8547 | SPI | South Pacific Island Airways, Inc. | Callsign: South Pacific, | USA | AVCODES |
| 8548 | SPI | South Pacific Island Airways | | | ICAO1 |
| 8549 | SPIA | SPITALE CO | | | SCAC4 |
| 8550 | SPIB | SUPERIOR LOGISTICS INC | | | SCAC4 |
| 8551 | SPIC | SPECIALIZED INC | | | SCAC4 |
| 8552 | SPIE | SHIPRITE INC | | | SCAC4 |
| 8553 | SPIEK | Inselbahn Spiekeroog | | D | TRAFFIC |
| 8554 | SPIH | STEPHENS CARRIERS INC | | | SCAC4 |
| 8555 | SPIJ | STEELE TRANSPORT INC | | | SCAC4 |
| 8556 | SPIK | STONE, PAUL IVAN JR TRUCKING | | | SCAC4 |
| 8557 | SPIL | SPEEDY INTERNATIONAL LLC | | | SCAC4 |
| 8558 | SPIN | SPARTA INNOVATIONS INC | | | SCAC4 |
| 8559 | SPIN | SPINELLI (ETS) | | FR | VKM |
| 8560 | SPIS | SPICA SHIPPING CO LTD | | | SCAC4 |
| 8561 | SPITZ | SPITZKE AG GUZ Berlin | | DE | VKM |
| 8562 | SPITZKE | Spitzke Logistik GmbH | Real: SLG | D | TRAFFIC |
| 8563 | SPIU | SAS SPINDRIFT | | F | BIC |
| 8564 | SPIV | SPI TRANSPORT SYSTEMS INC | | | SCAC4 |
| 8565 | SPIW | STRATEGIC ALLIANCE TRANSPORT | | | SCAC4 |
| 8566 | SPIX | Sweeteners Plus, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 8567 | SPIX | Sweeteners Plus, Inc. | Jul-00 | | NRHS |
| 8568 | SPIX | SWEETENERS PLUS, INC. | | | PWRC |
| 8569 | SPIX | Sweeteners Plus | | | RSRV |
| 8570 | SPIX | SWEETENERS PLUS INC | | | SCAC4 |
| 8571 | SPIY | STRIBLING PACKAGING INC | | | SCAC4 |
| 8572 | SPJ | Air Service | IATA: M3, Callsign: Air Skopje, | MK | AVCODES |
| 8573 | SPJ | Air Service | IATA: M3 | | ICAO1 |
| 8574 | SPJA | S | | | SCAC4 |
| 8575 | SPJB | SMC PROJECT MANAGEMENT LLC | | | SCAC4 |
| 8576 | SPJC | S P T | | | SCAC4 |
| 8577 | SPJD | SPAYRE, J D INC | | | SCAC4 |
| 8578 | SPJF | SYNTECH PRODUCTS CORPORATION | | | SCAC4 |
| 8579 | SPJH | SUNRISE PRODUCE INC | | | SCAC4 |
| 8580 | SPJI | SHIPLANE TRANSPORT INC | | | SCAC4 |
| 8581 | SPJK | SCHELP TRUCKING LLC | | | SCAC4 |
| 8582 | SPJM | SPECIAL PROJECTS INC | | | SCAC4 |
| 8583 | SPJO | SIRMON PRODUCE INC | | | SCAC4 |
| 8584 | SPJR | SANCHEZ PEREZ, JESUS | | | SCAC4 |
| 8585 | SPJS | SOUTHWEST PORT SERVICES INC | | | SCAC4 |
| 8586 | SPJT | SHIMP INCORPORATED | | | SCAC4 |
| 8587 | SPJV | SKEETER PRODUCTS INC | | | SCAC4 |
| 8588 | SPJX | SMS PENN JERSEY LINE | | | PWRC |
| 8589 | SPK | Diamond Aviation, Inc. | Callsign: Sparkle, | USA | AVCODES |
| 8590 | SPK | Solsars Lab, LLC | Callsign: Solstas Lab, | USA | AVCODES |
| 8591 | SPK | Diamond Aviation | | | ICAO1 |
| 8592 | SPKA | SHAPKA, DON TRUCKING LTD | | | SCAC4 |
| 8593 | SPKB | SPECTRA LOGISTICS SERVICES INC | | | SCAC4 |
| 8594 | SPKC | SEAPACK INC | | | SCAC4 |
| 8595 | SPKH | SUPER TRUCKING INC | | | SCAC4 |
| 8596 | SPKK | SPARKS OIL COMPANY INC | | | SCAC4 |
| 8597 | SPKM | SUPPLYONE OKLAHOMA CITY INC | | | SCAC4 |
| 8598 | SPKN | SPEEDY-PAK INC | | | SCAC4 |
| 8599 | SPKP | S P K ASSOCIATES INC | | | SCAC4 |
| 8600 | SPKR | SASSY P K TRUCKING INC | | | SCAC4 |
