| 9001 | SQDL | STORE TO DOOR LLC | | | SCAC4 |
| 9002 | SQDN | SUEDEMAS | | | SCAC4 |
| 9003 | SQDO | SUNSPACE MODULAR ENCLOSURES INC | | | SCAC4 |
| 9004 | SQEC | SPECTRUM CATERING | | | SCAC4 |
| 9005 | SQEH | STARLITE ENTERPRISES OF HARDY COUNT | | | SCAC4 |
| 9006 | SQEP | SON SHINE EXPRESS | | | SCAC4 |
| 9007 | SQES | SCALES EXPRESS INC | | | SCAC4 |
| 9008 | SQF | Slovak Air Force | Callsign: Slovak Air Force, | SK | AVCODES |
| 9009 | SQF | Slovak Air Force | | | ICAO1 |
| 9010 | SQGC | SPICER PLUS INC | | | SCAC4 |
| 9011 | SQGS | SITTON LOGISTICS LLC | | | SCAC4 |
| 9012 | SQH | Ford Aire | Callsign: Susquehanna, | USA | AVCODES |
| 9013 | SQH | Alaska Juneau Aeronautics, Inc. | Callsign: Sasquatch, Name changed to Seaport Airlines, Inc. | USA | AVCODES |
| 9014 | SQH | Seaport Airlines, Inc. | IATA: K5, Callsign: Sasquatch, Ceased operations on 20 September 2016 and filed for Chapter 7 bankruptcy. Name changed from Alaska Juneau Aeronautics, Inc. | USA | AVCODES |
| 9015 | SQHC | STROHL OIL CO | | | SCAC4 |
| 9016 | SQHD | SAHIR TRUCKING LTD | | | SCAC4 |
| 9017 | SQHE | SANDY HILLS ELK RANCH | | | SCAC4 |
| 9018 | SQHG | SEA CENTRAL SHIPPING CORPORATION | | | SCAC4 |
| 9019 | SQHI | STAHL OIL COMPANY INC | | | SCAC4 |
| 9020 | SQHK | SMITH, CURTIS TRUCKING | | | SCAC4 |
| 9021 | SQHM | SCHMUCKAL OIL CO | | | SCAC4 |
| 9022 | SQHN | SCHREINERS INC | | | SCAC4 |
| 9023 | SQHO | SHORES OIL COMPANY | | | SCAC4 |
| 9024 | SQIG | SUNSET LOGISTICS INC | | | SCAC4 |
| 9025 | SQIH | SHINE TRANSPORTATION INC | | | SCAC4 |
| 9026 | SQIN | SUMMIT TRANSPORTATION | | | SCAC4 |
| 9027 | SQIY | SALT CITY INC | | | SCAC4 |
| 9028 | SQKD | SOUTHEAST CONSOLIDATORS INC (LOGIST | | | SCAC4 |
| 9029 | SQKI | SEAQUA TRUCKING INC | | | SCAC4 |
| 9030 | SQKO | SOUTHEAST CONSOLIDATORS INC (BROKER | | | SCAC4 |
| 9031 | SQKR | SHELDRAKE TRANSPORT INC | | | SCAC4 |
| 9032 | SQKT | SOUTHLAKE TRANSPORT INC | | | SCAC4 |
| 9033 | SQKY | SKY TRANSPORT INC | | | SCAC4 |
| 9034 | SQL | Servicios de Alouiler Aereo, S.A. de C.V. | Callsign: Alquiler, | MEX | AVCODES |
| 9035 | SQL | Servicos De Alquiler | | | ICAO1 |
| 9036 | SQLA | SALAAMA TRUCKING INC | | | SCAC4 |
| 9037 | SQLB | STONERIDGE QUARRIES LTD | | | SCAC4 |
| 9038 | SQLC | STRUCTURAL TECH CORPORATION LTD | | | SCAC4 |
| 9039 | SQLD | SPECIAL LOGISTICS INC | | | SCAC4 |
| 9040 | SQLF | STARLITE COLONY FARMS LTD | | | SCAC4 |
| 9041 | SQLJ | SAN QUINTIN LOGISTICS | | | SCAC4 |
| 9042 | SQLL | SQL | | | SCAC4 |
| 9043 | SQLO | SPECTRUM LOGISTICS | | | SCAC4 |
| 9044 | SQLR | SEALE MARINE | | | SCAC4 |
| 9045 | SQLV | SLIM LINE VENDING INTERNATIONAL LTD | | | SCAC4 |
| 9046 | SQM | Evergreen Express Airways | Callsign: Skwim, | USA | AVCODES |
| 9047 | SQM | Siam Air Transport Co., Ltd. | IATA: O8, Callsign: Golden Fin, IATA Prefix: 874, | T | AVCODES |
| 9048 | SQM | Sociedad Química y Minera | | RCH | TRAFFIC |
| 9049 | SQMA | SMITH, ARTHUR TRUCKING INC | | | SCAC4 |
| 9050 | SQMC | S & M TRANSPORT | | | SCAC4 |
| 9051 | SQMD | SIERRA MOUNTAIN INC | | | SCAC4 |
| 9052 | SQME | SCOTT PETROLEUM CORPORATION | | | SCAC4 |
| 9053 | SQMI | STRUCTURAL METALS INC | | | SCAC4 |
| 9054 | SQMM | SCRUMMASTER | | | SCAC4 |
| 9055 | SQMN | S M TRANSPORT | | | SCAC4 |
| 9056 | SQMS | SUPERIOR MARITIME SERVICES INC | | | SCAC4 |
| 9057 | SQMV | SIMMONS MOVING & STORAGE INC | | | SCAC4 |
| 9058 | SQNA | SBS TRANSPORTATION INC | | | SCAC4 |
| 9059 | SQNC | SONOCO LIMITED | | | SCAC4 |
| 9060 | SQND | SENIOR OIL INC | | | SCAC4 |
| 9061 | SQNE | SEQUOIALINE INC | | | SCAC4 |
| 9062 | SQNI | SHANE TRANSPORTATION INC | | | SCAC4 |
| 9063 | SQNP | SUN TRANSPORT | | | SCAC4 |
| 9064 | SQNQ | SHELLHORN & HILL INC | | | SCAC4 |
| 9065 | SQNS | SUNSTATE CARRIERS INC | | | SCAC4 |
| 9066 | SQNT | STONES TRANSPORT INC | | | SCAC4 |
| 9067 | SQOC | SOCI PETROLEUM INC | | | SCAC4 |
| 9068 | SQOI | SCITUATE OIL CO INC | | | SCAC4 |
| 9069 | SQOL | STAR OIL CO | | | SCAC4 |
| 9070 | SQOO | STEPHENS OIL COMPANY | | | SCAC4 |
| 9071 | SQOP | SPILLERS OIL CO INC | | | SCAC4 |
| 9072 | SQOS | SOS EXPRESS LLC | | | SCAC4 |
| 9073 | SQOT | SOUTHERN OCEAN TRANSPORT, INC | | | SCAC1 |
| 9074 | SQOT | SOUTHERN OCEAN TRANSPORT INC | | | SCAC4 |
| 9075 | SQOY | SCOTT & COMPANY TRUCKING | | | SCAC4 |
| 9076 | SQP | SkyUp Airlines | IATA: PQ, Callsign: Skyup, IATA Prefix: 010, ICAO code changed from KUP w.e.f. 17 August 2018. | UA | AVCODES |
| 9077 | SQPG | SPILLE TRUCKING INC | | | SCAC4 |
| 9078 | SQPJ | SELEC TRANSPORT INC | | | SCAC4 |
| 9079 | SQPK | SCHMIDT, P R TRUCKING | | | SCAC4 |
| 9080 | SQPO | SPENCER OIL COMPANY INC | | | SCAC4 |
| 9081 | SQPT | SELECT TRANSPORT INCORPORATED | | | SCAC4 |
| 9082 | SQPV | ST PATRICKS VAN LINES INC | | | SCAC4 |
| 9083 | SQQD | SPEARE SEEDS | | | SCAC4 |
| 9084 | SQR | Alsaqer Aviation | Callsign: Alsaqer Aviation, | LAR | AVCODES |
| 9085 | SQR | Alsaqer Aviation | | | ICAO1 |
| 9086 | SQRA | STARTRANS INC | | | SCAC4 |
| 9087 | SQRC | STI TRANSPORT INC | | | SCAC4 |
| 9088 | SQRG | STREAMLINE LOGISTICS INC | | | SCAC4 |
| 9089 | SQRI | SALT RIVER TRANSPORT INC | | | SCAC4 |
| 9090 | SQRL | SIERRA OIL | | | SCAC4 |
| 9091 | SQRO | SPARTAN TRANSPORTATION INC | | | SCAC4 |
| 9092 | SQRP | STAR TRANSPORTS INC | | | SCAC4 |
| 9093 | SQRR | SURRATT TRANSPORT INC | | | SCAC4 |
| 9094 | SQRT | STAR TRANSPORT LLC | | | SCAC4 |
| 9095 | SQS | ASI Pudjiastuti Aviation, PT | Callsign: Sky Queen, | RI | AVCODES |
| 9096 | SQSA | SST SPECIALIZED TRANSPORTATION INC | | | SCAC4 |
| 9097 | SQSC | SOUTHERN QUEEN SHIPPING CO LTD | | | SCAC4 |
| 9098 | SQSE | STAR SERVICES INC | | | SCAC4 |
| 9099 | SQSF | SMITH & SONS FUEL & HEATING OIL CO | | | SCAC4 |
| 9100 | SQSH | SPECIAL LOGISTICS SOUTHEAST LLC | | | SCAC4 |
