| 1 | SPG | Springdale Air Service, Inc. | Callsign: Spring Air, | USA | AVCODES |
| 2 | SPG | Speedwings Executive Jet GmbH | Callsign: Speedwing, Merged into SPARFELL Luftfahrt GmbH after purchase. | A | AVCODES |
| 3 | SPG | Nordjet Airlines SL | Name changed from Sagolair Transportes Executoves SL. | E | AVCODES |
| 4 | SPG | Springdale Air Service | | | ICAO1 |
| 5 | SPGA | STARS & STRIPES TRANSPORTATION | | | SCAC4 |
| 6 | SPGC | SPRINGFIELD CARTAGE INC | | | SCAC4 |
| 7 | SPGE | SEA PRESTIGE TRADING CO SA PANAMA | | | SCAC4 |
| 8 | SPGG | SPRINT TRANSPORTS INC | | | SCAC4 |
| 9 | SPGI | SPRUNG, TED TRUCKING LLC | | | SCAC4 |
| 10 | SPGJ | SPRAGUE ENERGY CORPORATION | | | SCAC4 |
| 11 | SPGK | SPEIGHT, KURT WILLIAM | | | SCAC4 |
| 12 | SPGK | Sanockie Przedsiêbiorstwo Gospodarki Komunalnej sp. z o.o. | City: Sanok | PL | TRAFFIC |
| 13 | SPGL | SPERLING INDUSTRIES LTD | | | SCAC4 |
| 14 | SPGO | SPEEDWAY GAS & OIL CO | | | SCAC4 |
| 15 | SPGT | SPEC-TEC | | | SCAC4 |
| 16 | SPGU | OOO SPIKO-GROUP | | RUS | BIC |
| 17 | SPGU | UNION PACIFIC [SOUTHERN PACIFIC TRANSP CO] | | | PWRC |
| 18 | SPGV | SUPERIOR CARTAGE INC | | | SCAC4 |
| 19 | SPGW | SPAULDING, G W TRUCKING CO | | | SCAC4 |
| 20 | SPGX | Suburban Propane Gas Corp. | 1/1950 | | NAKINA |
| 21 | SPGX | Suburban Propane—Division of Quantum Chemical Corp. | added 10/1995; eliminated 4/1997 | | NAKINA |
| 22 | SPGX | Suburban Propane L.P. | added 4/1997; 7/2000-7/2005; eliminated 1/2006 | | NAKINA |
| 23 | SPGX | Suburban Propane--Division of Quantum Chemical Corp. | added 10/95; eliminated 4/97 | | NRHS |
| 24 | SPGX | Suburban Propane L.P. | added 4/97; 7/2000 | | NRHS |
| 25 | SPGX | SUBURBAN PROPANE LP | | | PWRC |
| 26 | SPGX | Suburban Propane | | | RSRV |
