| 1 | SKP | Aero-North Aviation Services | Callsign: Skipper, | CDN | AVCODES |
| 2 | SKP | Skytrans Regional Pty Ltd t/a Skytrans Airlines | IATA: Q6, Callsign: Skytrans, Designator Q6 reinstated by IATA | AUS | AVCODES |
| 3 | SKP | Skytrans Regional Pty Ltd t/a Skytrans Airlines | IATA: QN, Callsign: Skytrans, Designator Q6 recalled by IATA | AUS | AVCODES |
| 4 | SKP | Aero-North Aviation Services | | | ICAO1 |
| 5 | SKPA | SKYPARTS AVIATION | | | SCAC4 |
| 6 | SKPB | SHOCKAKHA | | | SCAC4 |
| 7 | SKPD | SOHI K P TRUCKING LTD | | | SCAC4 |
| 8 | SKPE | STOCKTON PETROLEUM COMPANY INCORPOR | | | SCAC4 |
| 9 | SKPF | STARK PRODUCTS | | | SCAC4 |
| 10 | SKPG | SHAMROCK PRODUCE & BROKERAGE CORP | | | SCAC4 |
| 11 | SKPI | SOUTH KENTUCKY PETROLEUM INC | | | SCAC4 |
| 12 | SKPK | SKOPELOS PRODUCT TANKER CORPORATION | | | SCAC4 |
| 13 | SKPL | SKYPORT LINES INC | | | SCAC4 |
| 14 | SKPL | Stowarzyszenie Kolejowych Przewozów Lokalnych | | PL | TRAFFIC |
| 15 | SKPL | SKPL Cargo Sp. z o.o | | PL | VKM |
| 16 | SKPO | SKIPS OIL CO | | | SCAC4 |
| 17 | SKPOST | Slovenská posta | Real: SP | SK | TRAFFIC |
| 18 | SKPQ | SAMSKIP HF KEYKJAVIK ICELAND | | | SCAC4 |
| 19 | SKPR | Southern Kent & Pacific R.R. Co. | 1/1994-7/2005 | | NAKINA |
| 20 | SKPR | Southern Kent & Pacific R.R. Co. | 1/94-7/2000 | | NRHS |
| 21 | SKPR | SOUTHERN KENT & PACIFIC RR CO. | | | PWRC |
| 22 | SKPR | Southern Kent and Pacific RR | | | RSRV |
| 23 | SKPT | SKIPAT TRUCKING CO | | | SCAC4 |
| 24 | SKPV | SUMMERS CREEK ENTERPRISES INC | | | SCAC4 |
| 25 | SKPX | Wm. Schluderberg-T.J. Kurdle Co. | 7/1930-7/1935 | | NAKINA |
| 26 | SKPX | The Saskatchewan Grain Car Corp. | added 1/1981; eliminated 7/1985, 1/1994-7/2005 (not listed) | | NAKINA |
| 27 | SKPX | The Saskatchewan Grain Car Corp. | added 1/81; 1/94-7/2000 | | NRHS |
| 28 | SKPX | *WM. SCHULDERBERG-T.J. KURDLE CO. | | | PWRC |
| 29 | SKPX | +SASKATCHEWAN GRAIN CAR CORPORATION | | | PWRC |
| 30 | SKPX | Saskatchewan Grain Car Corporation | | | RSRV |
| 31 | SKPX | SASKATCHE | | | SCAC4 |
