Showing 1,012 registered airlines with a combined fleet of 8,882 airframes.
| Airline Name | ICAO / IATA | Fleet Size |
|---|---|---|
| Southwest Airlines | SWA / WN | 738 |
| Special Aviation Systems | SYV | 0 |
| Spectrum Air Service | XSA | 0 |
| Spirit Airlines | NKS / NK | 84 |
| Spirit Aviation | SJJ | 10 |
| Sport Air Travel | WCC | 8 |
| Sprague Electric Company | SPE | 0 |
| Springdale Air Service | SPG | 2 |
| Star West Aviation | SUU | 0 |
| State of Nebraska | NEB | 0 |