| 5601 | SKGS | SKAGGS TRUCKING INC | | | SCAC4 |
| 5602 | SKGT | SKAGIT GARDENS INC | | | SCAC4 |
| 5603 | SKGV | S E L TRUCKING INC | | | SCAC4 |
| 5604 | SKGW | S & B TRUCKING OF WINDSOR CORP | | | SCAC4 |
| 5605 | SKGX | Sibley Railcar & Parts, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 5606 | SKGX | Sibley Railcar & Pats, Inc. | Jul-00 | | NRHS |
| 5607 | SKGX | SIBLEY RAILCAR & PARTS INC. | | | PWRC |
| 5608 | SKGX | Sibley Railcar and Parts | | | RSRV |
| 5609 | SKGX | SIBLEY RAILCAR & PARTS INC | | | SCAC4 |
| 5610 | SKH | Skyways Regional AB | Callsign: Skyreg, | S | AVCODES |
| 5611 | SKH | Sakha Airlines | Callsign: Air Sakha, | RUS | AVCODES |
| 5612 | SKH | Svenska Direktflyg AB | IATA: HS, Callsign: Skyreg, ICAO designator changed to HSV. ICAO designator changed from HIL, ICAO callsign changed from Highland. Name changed from Skyways Regional AB | S | AVCODES |
| 5613 | SKH | British Sky Broadcasting Ltd. | Callsign: Skynews, | GB | AVCODES |
| 5614 | SKH | British Sky Broadcasting | | | ICAO1 |
| 5615 | SKHA | SUN LINK (USA) INC | | | SCAC4 |
| 5616 | SKHB | SKY HARBOR TRUCKING LLC | | | SCAC4 |
| 5617 | SKHC | SMUCKER SHIPPING LLC | | | SCAC4 |
| 5618 | SKHF | SKYHAWK TRANSFER INC | | | SCAC4 |
| 5619 | SKHG | SPRAGUE, KEITH TRUCKING | | | SCAC4 |
| 5620 | SKHI | SEKUR HOLDINGS INC | | | SCAC4 |
| 5621 | SKHK | SUKH TRUCKING | | | SCAC4 |
| 5622 | SKHP | SKY TRANSPORTATION SERVICES INC | | | SCAC4 |
| 5623 | SKHU | SINOKOR MERCHANT MARINE CORP | | ROK | BIC |
| 5624 | SKHU | SINOKOR MERCHANT MARINE CO LTD | | | SCAC4 |
| 5625 | SKI | TCI Skyking Ltd. | IATA: RU, Callsign: Skyking, Founded in 1994. Ceased operations on 22 October 2008 on as merged into Air Turks and Caicos. Desigantor RU* reinstated by IATA | USA | AVCODES |
| 5626 | SKI | Skyking | | | ICAO1 |
| 5627 | SKI | SkyKing Turks and Caicos Airways | IATA: RU | | ICAO1 |
| 5628 | SKIB | SKIPPERS SHIPPER | | | SCAC4 |
| 5629 | SKIC | SCOTT-N-SLICE TRUCKING | | | SCAC4 |
| 5630 | SKID | SKIPPER LOGISTICS INC | | | SCAC4 |
| 5631 | SKIE | SKYE ISLE INC | | | SCAC4 |
| 5632 | SKIER | MZK Skierniewice | | PL | TRAFFIC |
| 5633 | SKII | SAMSKIP INC | | | SCAC4 |
| 5634 | SKIL | SKIL SERVICES | | | SCAC4 |
| 5635 | SKIN | SMOKINLICIOUS.COM | | | SCAC4 |
| 5636 | SKINE | Skinest Rail AS | | EST | TRAFFIC |
| 5637 | SKIO | SH KARTING INC | | | SCAC4 |
| 5638 | SKIQ | STILL KICK'N INC | | | SCAC4 |
| 5639 | SKIR | SKIERKA, A TRUCKING | | | SCAC4 |
| 5640 | SKIS | STAPLETON TRUCKING INC | | | SCAC4 |
| 5641 | SKIU | BLUE SKY INTERMODAL (UK) LTD | | GB | BIC |
| 5642 | SKIU | (XTRZ) XTRA LEASE | | | PWRC |
| 5643 | SKIU | XTRA Intermodal | | | RSRV |
| 5644 | SKIU | BLUE SKY INTERMODAL (UK) LTD | | | SCAC4 |
| 5645 | SKIV | SKIVA INTERNATIONAL INC | | | SCAC4 |
| 5646 | SKIW | SAKARA INTERNATIONAL | | | SCAC4 |
| 5647 | SKIY | SKISKOOTYS | | | SCAC4 |
| 5648 | SKIZ | (XTRZ) XTRA LEASE | | | PWRC |
| 5649 | SKIZ | XTRA Intermodal | | | RSRV |
| 5650 | SKIZ | XTRA INTERMODAL | | | SCAC4 |
| 5651 | SKJ | Skyjet, Inc. | | AG | AVCODES |
| 5652 | SKJ | Sky Net Airline | Callsign: Skynet Air, | AM | AVCODES |
| 5653 | SKJ | Seagle Jet S.r.o. | Callsign: Slovak Jet, | SK | AVCODES |
| 5654 | SKJ | Skånska Järnvägar AB | | SE | VKM |
| 5655 | SKJA | SOO KCS JOINT AGANCY | | | PWRC |
| 5656 | SKJAB | Skövde Karlsborgs Järnväg AB | | SE | VKM |
| 5657 | SKJB | Skandinaviska Jernbanor AB | | S | TRAFFIC |
| 5658 | SkJb | Skandinaviska Jernbanor AB | | SE | VKM |
| 5659 | SKJC | STL TRUCKING LLC | | | SCAC4 |
| 5660 | SKJJ | SEKLECKI, J J TRANSPORT INC | | | SCAC4 |
| 5661 | SKJK | SHANK, JADE TRUCKING | | | SCAC4 |
| 5662 | SKJT | SMITH, KEVIN J TRUCKING | | | SCAC4 |
| 5663 | SKJY | SHIRK, JAY TRANSPORT | | | SCAC4 |
| 5664 | SKK | Skylink Aviation, Inc. | Callsign: Skylink, | CDN | AVCODES |
| 5665 | SKK | Skylane Air Charter | Callsign: Skylane, Formerly Skylane Flight Centre | GB | AVCODES |
| 5666 | SKK | ASKY | IATA: KP, Callsign: Asky Airline, IATA Prefix: 032, | TG | AVCODES |
| 5667 | SKK | Skylink Aviation | | | ICAO1 |
| 5668 | SKK | Asky Airlines | | TG | TRAFFIC |
| 5669 | SKKB | STREMICK TRUCKING | | | SCAC4 |
| 5670 | SKKD | SPECIAL K TRUCKING | | | SCAC4 |
| 5671 | SKKE | SIMKE, K GUNDRILLING | | | SCAC4 |
| 5672 | SKKG | STEFANCZYK TRUCKING | | | SCAC4 |
| 5673 | SKKI | SCHOMAKE | | | SCAC4 |
| 5674 | SKKJ | SIMMONS, K TRUCKING INC | | | SCAC4 |
| 5675 | SKKN | S K TRUCKING | | | SCAC4 |
| 5676 | SKKR | SHOTTENKIRK TRANSPORTS | | | SCAC4 |
| 5677 | SKKS | SHOEMAK | | | SCAC4 |
| 5678 | SKKU | SLOVAK COMBINED TRANSPORT INTRANS A | | | SCAC4 |
| 5679 | SKKX | Sugar Creek Creamery Co. (American Refrigerator Transit Co.) | 7/1935 | | NAKINA |
| 5680 | SKL | Skycharter (Malton) Limited | Callsign: Skycharter, | CDN | AVCODES |
| 5681 | SKL | Skycharter (Malton) | | | ICAO1 |
| 5682 | SKL | SKL Umschlagservice GmbH & Co KG | Magdeburg (SKL = Schwermaschinenbaukombinat Karl Liebknecht) | D | privat-bahn.de |
| 5683 | SKLA | SKULL TRANSPORT INC | | | SCAC4 |
| 5684 | SKLB | SENKBEIL, ROBERT | | | SCAC4 |
| 5685 | SKLG | S K LOGISTIC INC | | | SCAC4 |
| 5686 | SKLH | SPARK LOGISTICS INC | | | SCAC4 |
| 5687 | SKLJ | Skara-Lundsbrunns Järnvägar | | SE | VKM |
| 5688 | SKLM | SKY LINE MOVERS INC | | | SCAC4 |
| 5689 | SKLN | SKYLINE LOGISTICS INC | | | SCAC4 |
| 5690 | SKLO | STARTEK LOGISTICS | | | SCAC4 |
| 5691 | SKLP | SKYLINE TRANSPORT | | | SCAC4 |
| 5692 | SKLQ | SKYLINE CARRIERS LTD | | | SCAC4 |
| 5693 | SKLR | SCHECKLA CO | | | SCAC4 |
| 5694 | SKLS | SHARK LINES, INC. | | | SCAC1 |
| 5695 | SKLS | SHARKLINES INC | | | SCAC4 |
| 5696 | SKLT | STILES & KELLY TRANSFER LTD | | | SCAC4 |
| 5697 | SKLU | SINOKOR MERCHANT MARINE CORP | | ROK | BIC |
| 5698 | SKLU | SINOKOR MERCHANT MARINE CO LTD | | | SCAC4 |
| 5699 | SKLUS | SKL Umschlagservice Magdeburg GmbH & Co.KG | | DE | VKM |
| 5700 | SKLY | STRICKLY TRUCKIN INC | | | SCAC4 |
