| 1 | SPK | Diamond Aviation, Inc. | Callsign: Sparkle, | USA | AVCODES |
| 2 | SPK | Solsars Lab, LLC | Callsign: Solstas Lab, | USA | AVCODES |
| 3 | SPK | Diamond Aviation | | | ICAO1 |
| 4 | SPKA | SHAPKA, DON TRUCKING LTD | | | SCAC4 |
| 5 | SPKB | SPECTRA LOGISTICS SERVICES INC | | | SCAC4 |
| 6 | SPKC | SEAPACK INC | | | SCAC4 |
| 7 | SPKH | SUPER TRUCKING INC | | | SCAC4 |
| 8 | SPKK | SPARKS OIL COMPANY INC | | | SCAC4 |
| 9 | SPKM | SUPPLYONE OKLAHOMA CITY INC | | | SCAC4 |
| 10 | SPKN | SPEEDY-PAK INC | | | SCAC4 |
| 11 | SPKP | S P K ASSOCIATES INC | | | SCAC4 |
| 12 | SPKR | SASSY P K TRUCKING INC | | | SCAC4 |
| 13 | SPKS | SPAIN TRUCKING | | | SCAC4 |
| 14 | SPKT | SPECIAL K TRANSPORT INC | | | SCAC4 |
| 15 | SPKU | SPINNAKER LEASING CORPORATION | | USA | BIC |
| 16 | SPKU | CONTAINER INVESTMENT PROJECT NUMBER | | | SCAC4 |
| 17 | SPKV | SEABOARD PRODUCE DISTRIBUTORS | | | SCAC4 |
| 18 | SPKW | SHIPKA TRUCKING INC | | | SCAC4 |
| 19 | SPKX | Shawinigan Products Corp. | 7/1930-4/1970; eliminated 4/1973 | | NAKINA |
| 20 | SPKX | Shawinigan Products Corp. | 4/38-4/70; eliminated 4/73 | | NRHS |
| 21 | SPKX | SHAWINIGAN PRODUCTS CORP. | | | PWRC |
