| 1 | SG | P.T. Sempati Air | ICAO: SSR, Callsign: Spirow, Declared Bankrupt. | RI | AVCODES |
| 2 | SG | Air Sarnia Ltd. | ICAO: ASG, Callsign: Air Sarnia, | GB | AVCODES |
| 3 | SG | Jetsgo Corporation | ICAO: JGO, Callsign: Jetsgo, Ceased operations on 11 March 2005. | CDN | AVCODES |
| 4 | SG | Aerotransporte Litoral Argentino, S.A. | Callsign: Ala, | RA | AVCODES |
| 5 | SG | Spacegrand | | GB | AVCODES |
| 6 | SG | Royal Airlines Limited d/b/a Spice Jet | ICAO: MOD, Callsign: Modiluft, ICAO designator changed to SEJ. ICAO callsign changed to Spicejet. Name changed from Royal Airlines Limited. IATA designator changed from 0S. | IND | AVCODES |
| 7 | SG | Royal Airlines Limited d/b/a Spice Jet | ICAO: SEJ, Callsign: Spicejet, ICAO designator changed from MOD. ICAO callsign changed to Modiluft. Name changed from Royal Airlines Limited. IATA designator changed from 0S. | IND | AVCODES |
| 8 | SG | SpiceJet Ltd | ICAO: SEJ, Callsign: Spicejet, IATA Prefix: 775, ICAO designator changed from MOD. ICAO callsign changed to Modiluft. Name changed from Royal Airlines Limited. IATA designator changed from 0S. | IND | AVCODES |
| 9 | SG | LHG Service Gesellschaft mbH | | DE | VKM |
| 10 | SGA | Air Saigon | Callsign: Air Saigon, Ceased operations. | VN | AVCODES |
| 11 | SGA | Air Saigon | | | ICAO1 |
| 12 | SGA | | | CH | TRAFFIC |
| 13 | SGAA | SPRING AIR INDUSTRIAL ACOUSTICS LTD | | | SCAC4 |
| 14 | SGAB | SIMPLY GREEN A BIOFUELS CO LLC | | | SCAC4 |
| 15 | SGAD | SONNY & G AUTOMOTIVE | | | SCAC4 |
| 16 | SGAE | SAINT GOBAIN ABRASIVOS S A DE C V | | | SCAC4 |
| 17 | SGAF | Singapore Army | | SGP | TRAFFIC |
| 18 | SGAG | SEAGULL MARITIME AGENCIES PRIVATE L | | | SCAC4 |
| 19 | SGAG | Stahl Gerlafingen AG | | CH | VKM |
| 20 | SGAH | SOLIS GARCIA, NORMA | | | SCAC4 |
| 21 | SGAI | SANDOVAL GARZA, SAN JUANA EMILIA | | | SCAC4 |
| 22 | SGAJ | STAR RGA | | | SCAC4 |
| 23 | SGAK | SHEEHAN, J E CONTRACTING CORPORATIO | | | SCAC4 |
| 24 | SGAN | ST GEORGE AUTOMOTIVE INC | | | SCAC4 |
| 25 | SGAR | SMITH GARDENS INC | | | SCAC4 |
| 26 | SGAU | MINISTERE DE LA DEFENSE (DCSID) | | F | BIC |
| 27 | SGAU | SAGA & COMPANY, LTD. | | | PWRC |
| 28 | SGAU | Saga and Limited | | | RSRV |
| 29 | SGAV | STI LOGISTICS INC | | | SCAC4 |
| 30 | SGAX | SGA Leasing Co. | added 7/1983; 1/1994-7/2005 | | NAKINA |
| 31 | SGAX | SGA Leasing Co. | 1/94-7/2000 | | NRHS |
| 32 | SGAX | SGA LEASING COMPANY | | | PWRC |
| 33 | SGAX | SGA Leasing | | | RSRV |
| 34 | SGAX | TRANSPORTATION EQUIPMENT INC | | | SCAC4 |
| 35 | SGAY | SIEGEL OIL COMPANY | | | SCAC4 |
| 36 | SGB | Sky King, Inc. d/b/a Fly First Class | IATA: F3, Callsign: Songbird, Name changed to Skyking Inc. | USA | AVCODES |
| 37 | SGB | Sky King, Inc. | IATA: F3, Callsign: Songbird, Designator F3* recalled by IATA. Name changed from Sky King, Inc. d/b/a Fly First Class | USA | AVCODES |
| 38 | SGB | Sky King, Inc. | IATA: 5K, Callsign: Songbird, Ceased operations on 26 January 2014. Designator F3* recalled by IATA. Name changed from Sky King, Inc. d/b/a Fly First Class | USA | AVCODES |
| 39 | SGB | Sky King, Inc. | IATA: 6K, Callsign: Songbird, Operations resumed on 22 December 2014. Founded in July 1990. Ceased operation on 26 January 2014. Designator F3* recalled by IATA | USA | AVCODES |
| 40 | SGB | Songbird Airways, Inc. | IATA: 6K, Callsign: Songbird, Name changed from Sky King, Inc in June 2015. | USA | AVCODES |
| 41 | SGB | Sky King | | | ICAO1 |
| 42 | SGB | Stoomtram Goes-Borsele | | NL | TRAFFIC |
| 43 | SGBA | STERLING BROKERAGE SERVICES INC | | | SCAC4 |
| 44 | SGBI | SECURE GLOBAL LOGISTICS INC | | | SCAC4 |
| 45 | SGBM | SEA GLOBAL SCM LTD | | | SCAC4 |
| 46 | SGBN | STAR FREIGHT BROKERS INC | | | SCAC4 |
| 47 | SGBO | SUMISHO GLOBAL LOGISTICS CO LTD | | | SCAC4 |
| 48 | SGBV | SIRIUS GLOBAL LOGISTICS CO LTD | | | SCAC4 |
| 49 | SGC | Southern Right Air Charter CC | Callsign: Southernright, | ZA | AVCODES |
| 50 | SGC | Spec Energy | Callsign: Spec Wings, | RSM | AVCODES |
| 51 | SGC | Southern Right Air Charter | | | ICAO1 |
| 52 | SGCB | SERROMAH SHIPPING BV | | | SCAC4 |
| 53 | SGCC | SEAGATE LOGISTICS LLC | | | SCAC4 |
| 54 | SGCD | SAN GREGORY CARTAGE INC | | | SCAC4 |
| 55 | SGCE | STAGE COACH CARTAGE AND DISTRIBUTIO | | | SCAC4 |
| 56 | SGCG | SNUG COTTAGE IMPORTS INC | | | SCAC4 |
| 57 | SGCH | STAGECOACH EXPRESS INC | | | SCAC4 |
| 58 | SGCI | SCNARRINGA GREENHOUSES LTD | | | SCAC4 |
| 59 | SGCJ | SUISSE GOLD CORP | | | SCAC4 |
| 60 | SGCL | SEAGULL CONTAINER LINE INC | | | SCAC4 |
| 61 | SGCM | STRANG CEDAR LIMITED | | | SCAC4 |
| 62 | SGCO | SOUTHERN PRIDE HOLDINGS LTD | | | SCAC4 |
| 63 | SGCPP | SAINT-GOBAIN CONSTRUCTION PRODUCTS POLSKA Sp. z o.o. | | PL | VKM |
| 64 | SGCR | SAILING CRUISE INC | | | SCAC4 |
| 65 | SGCS | SIGLER FREIGHT SERVICE | | | SCAC4 |
| 66 | SGCT | SUN ERGOS, A COMPANY OF THEATRE AND | | | SCAC4 |
| 67 | SGCU | SOGECO INTERNATIONAL SA | | CH | BIC |
| 68 | SGCW | STEINWEG, C (BALTIMORE) INC | | | SCAC4 |
| 69 | SGCX | Sungas Corp. of Florida | added 1/1974; 1/1975-7/2005 | | NAKINA |
| 70 | SGCX | Sungas Corp. of Florida | added 1/74; 1/75-7/2000 | | NRHS |
| 71 | SGCX | SUNGAS CORP OF FLORIDA | | | PWRC |
| 72 | SGCX | Sungas Corporation of Florida | | | RSRV |
| 73 | SGCX | SUNGAS CORP OF FLORIDA | | | SCAC4 |
| 74 | SGCY | SNIPES GENERAL CONTRACTING | | | SCAC4 |
| 75 | SGCZ | SOUTHWEST GRAIN CO. | | | PWRC |
| 76 | SGD | South East Asian Airlines (Seair) International, Inc. | IATA: XO, Callsign: Air Blue, IATA Prefix: 397, | RP | AVCODES |
| 77 | SGD | Sky Gate International Aviation | | | ICAO1 |
| 78 | SGDA | SRAH GOODS CARRIER | | | SCAC4 |
| 79 | SGDG | SKYLAND GRAIN LLC | | | SCAC4 |
| 80 | SGDN | SLEDGE, DANNIE TRUCKING | | | SCAC4 |
| 81 | SGDQ | STRATEGIC DELIVERY SOLUTIONS INC | | | SCAC4 |
| 82 | SGDR | SUPREME GARAGE DOORS INC | | | SCAC4 |
| 83 | SGDS | SURE GROWTH DISTRIBUTING INCORPORAT | | | SCAC4 |
| 84 | SGDT | STAGE DOOR TRANSPORTATION | | | SCAC4 |
| 85 | SGDU | STABILIS GDS INC | | USA | BIC |
| 86 | SGDV | SHOTGUN DELIVERY INC | | | SCAC4 |
| 87 | SGE | Southern Gateway | Callsign: South Gate, | GQ | AVCODES |
| 88 | SGEA | SAVANNAH CARTAGE INC | | | SCAC4 |
| 89 | SGEE | SANGAREE TRANSPORTATION | | | SCAC4 |
| 90 | SGEH | STEINERT ENERGY CO | | | SCAC4 |
| 91 | SGEK | STRETCH LOGISTICS | | | SCAC4 |
| 92 | SGEN | SIGONT EXPRESS INC | | | SCAC4 |
| 93 | SGEO | STROMGREN, A FARM | | | SCAC4 |
| 94 | SGEQ | STREAMLINE LOGISTICS LLC | | | SCAC4 |
| 95 | SGET | SELAGON TRANSPORTATION LLC | | | SCAC4 |
| 96 | SGEW | STOKES, GEORGE W CO | | | SCAC4 |
| 97 | SGEY | SOUTHERN GATEWAY TRANSPORT | | | SCAC4 |
| 98 | SGF | Swiss Government Flights (STAC) | Callsign: STAC, | CH | AVCODES |
| 99 | SGF | STAC Swiss Government Flights | | | ICAO1 |
| 100 | SGFB | SG BORDER CARRIER | | | SCAC4 |
