| 1 | CTX | Corporate Air Fleet, Inc. | Callsign: Catbird, | USA | AVCODES |
| 2 | CTX | Cen-Tex Airlines, Inc. | Callsign: Cen-Tex, | USA | AVCODES |
| 3 | CTX | Caterpillar Tractor Co. | 1/1950-1/1952; eliminated 1/1953 | | NAKINA |
| 4 | CTX | Central Texas Refining Co. | 7/1930-7/1932 | | NAKINA |
| 5 | CTX | Crescent Tank Line (General Chemical Co.) | 8/1920 | | NAKINA |
| 6 | CTX | Caterpillar Tractor Co. | 1/52; eliminated 1/53 | | NRHS |
| 7 | CTX | *GENERAL CHEMICAL CO. [CRESCENT TANK LINE] | | | PWRC |
| 8 | CTX | *CENTRAL TEXAS REFINING CO. | | | PWRC |
| 9 | CTX | *CATERPILLAR TRACTOR CO. | | | PWRC |
| 10 | CTXB | CHEROKE TRUCK BROKERS LLC | | | SCAC4 |
| 11 | CTXD | CAN-TEX INDUSTRIES (DIV OF HARSCO C | | | SCAC3 |
| 12 | CTXD | CAN-TEX INC | | | SCAC4 |
| 13 | CTXE | CITY TAXI | | | SCAC3 |
| 14 | CTXE | CTE EXPRESS INC | | | SCAC4 |
| 15 | CTXF | CAL-TEX TRUCKING INC | | | SCAC3 |
| 16 | CTXF | CAN TRANS XPRESS INC | | | SCAC4 |
| 17 | CTXG | CROSSTOWN EXPEDITING | | | SCAC3 |
| 18 | CTXH | CTX-LAMBIE INC | | | SCAC4 |
| 19 | CTXI | CA-TRUST TRANSPORTATION SERVICES | | | SCAC4 |
| 20 | CTXJ | CONTEX TRANSPORT INC | | | SCAC3 |
| 21 | CTXJ | CENTRAL TEXAS TRAILS | | | SCAC4 |
| 22 | CTXL | CAS TRANSPORTATION INC | | | SCAC3 |
| 23 | CTXL | CTX LOGISTICS INC | | | SCAC4 |
| 24 | CTXN | CTX-TL INC | | | SCAC4 |
| 25 | CTXP | CALTEX TANKER CO PTY SYDNEY AUSTRAL | | | SCAC3 |
| 26 | CTXP | CNR TRANSPORT INC | | | SCAC4 |
| 27 | CTXQ | CAL-TEX TRUCKING CANADA-USA LTD | | | SCAC3 |
| 28 | CTXQ | CAL-TEX TRUCKING CANADA-USA LTD | | | SCAC4 |
| 29 | CTXR | C T EXPRESS INC | | | SCAC3 |
| 30 | CTXT | CAR-TEX TRANSPORT & VACUUM SERVICE | | | SCAC3 |
| 31 | CTXT | CARTEL TRANSPORT LLC | | | SCAC4 |
| 32 | CTXU | CONTAINEX CONTAINER -HANDELSGESELLSCHAFT MBH | | A | BIC |
| 33 | CTXU | CONTAINEX CONTAINEX CONTAINER DEPOT | | | SCAC3 |
| 34 | CTXU | CONTAINEX CONTAINER -HANDELSGESELLS | | | SCAC4 |
| 35 | CTXV | COUNTRY TRUCKING & EXCAVATING INC | | | SCAC3 |
| 36 | CTXV | CAL-TEX AUTO MOVERS INC | | | SCAC4 |
| 37 | CTXW | CTX DIVISION OF CT TRANSPORT | | | SCAC3 |
| 38 | CTXW | CARGO TRANSPORT WORLD | | | SCAC4 |
