Showing 1,012 registered airlines with a combined fleet of 8,882 airframes.
| Airline Name | ICAO / IATA | Fleet Size |
|---|---|---|
| Tri-State Aero | TSS | 0 |
| Tristar Airlines | TRY | 0 |
| Tropic Airlines-Air Molokai | TRO | 0 |
| Twin Cities Air Service | TCY | 0 |
| Twin Town Leasing Company | TNY | 0 |
| U.S. Department of the Interior | DOI | 0 |
| Ultra Air | ULS / U0 | 4 |
| Ultrair | ULT | 0 |
| Union Flights | UNF | 0 |
| United Airlines | UAL / UA | 912 |