| 1 | CTP | Tashkent Aircraft Production Corporation | IATA: 3S, Callsign: Cortas, IATA designator changed from PQ*, then to 4C* | UZ | AVCODES |
| 2 | CTP | Tashkent Aircraft Production Corporation | IATA: 4C, Callsign: Cortas, IATA designator changed from PQ* | UZ | AVCODES |
| 3 | CTP | Tashkent Aircraft Production Corporation | IATA: PQ, Callsign: Cortas, IATA designator changed to 4C* | UZ | AVCODES |
| 4 | CTP | Tashkent Aircraft Production Corporation | | | ICAO1 |
| 5 | CTP | | | I | TRAFFIC |
| 6 | CTPA | PROVIDENCE & WOOSTER RAILROAD CO. [CONNECTICUT RAILROAD SYSTEMS, INC.] | | | PWRC |
| 7 | CTPA | CTP TRANSPORT INC | | | SCAC4 |
| 8 | CTPB | CANNON TRANSPORTATION | | | SCAC3 |
| 9 | CTPB | CARLEN LOGISTICS INC | | | SCAC4 |
| 10 | CTPC | CONTINENTAL TRANSPORTATION EXPRESS | | | SCAC3 |
| 11 | CTPC | CONNELL TRANSPORT CO LTD | | | SCAC4 |
| 12 | CTPD | CLARK TRANSPORTATION CO | | | SCAC3 |
| 13 | CTPE | COASTAL TRANSPORTATION INC | | | SCAC3 |
| 14 | CTPE | CORSA TRANSPORTES S A DE C V | | | SCAC4 |
| 15 | CTPF | COLA TRANSPORT | | | SCAC3 |
| 16 | CTPF | CALI TRANS CORP | | | SCAC4 |
| 17 | CTPG | CONTRACT TRANSPORT INC | | | SCAC3 |
| 18 | CTPI | CRESCENT TRANSPORTATION CO | | | SCAC3 |
| 19 | CTPL | COLLINS TRANSPORT SERVICE, INC | | | SCAC3 |
| 20 | CTPL | COMPLETE TRANSPORTATION LLC | | | SCAC4 |
| 21 | CTPM | évolitY | City: Montbéliard | F | TRAFFIC |
| 22 | CTPN | CMT TRANSPORT INC | | | SCAC4 |
| 23 | CTPO | CUSTOM TRANSPORT INC | | | SCAC3 |
| 24 | CTPO | Compagnie des transports de la porte océane - Le Havre | A Veolia company | F | TRAFFIC |
| 25 | CTPQ | CONSOLIDATED TRANSPORTATION SERVICE | | | SCAC3 |
| 26 | CTPQ | CIRCLE T PETROLEUM | | | SCAC4 |
| 27 | CTPR | CONTRACT TRANSPORTATION SERVICES | | | SCAC3 |
| 28 | CTPS | COCHRAN TRANSPORTATION SERVICE INC | | | SCAC3 |
| 29 | CTPS | COMPLETE TRANSPORTATION SERVICE INC | | | SCAC4 |
| 30 | CTPT | CONTRACTORS TRANSPORT CORP | | | SCAC3 |
| 31 | CTPT | COOK TRANSPORT INC | | | SCAC4 |
| 32 | CTPU | PT PELAYARAN CARAKA TIRTA PERKASA | | RI | BIC |
| 33 | CTPU | CAMILLO TRANSPORT | | | SCAC3 |
| 34 | CTPV | CART TRANSPORT INC | | | SCAC3 |
| 35 | CTPV | CENTREPOINT SERVICES | | | SCAC4 |
| 36 | CTPW | COASTAL TRANSPORTATION CO | | | SCAC3 |
| 37 | CTPW | CARRELL TRANSPORTATION SEVICES INC | | | SCAC4 |
| 38 | CTPX | Courtesy Corp. | added 7/1992; eliminated 10/1993; 1/1994-7/2005 (not listed) | | NAKINA |
| 39 | CTPX | CertainTeed Corp. | added 4/1977; 1/1980; eliminated 4/1986 | | NAKINA |
| 40 | CTPX | Certain-teed Products Corp. | added 11/1973; 1/1975; eliminated 4/1977 | | NAKINA |
| 41 | CTPX | Certain-teed Products Corp. | added 11/73; 1/75 | | NRHS |
| 42 | CTPX | CertainTeed Corp. | 1/80; eliminated 4/86 | | NRHS |
| 43 | CTPX | Courtesy Corp. | added 7/92; eliminated 10/93; 1/94-7/2000 | | NRHS |
| 44 | CTPX | *CERTAIN TEED CORPORATION | | | PWRC |
| 45 | CTPX | +COURTESY CORPORATION | | | PWRC |
| 46 | CTPX | Certain Teed Corporation (Courtesy Corporation) | | | RSRV |
| 47 | CTPX | COURTESY CORPORATION | | | SCAC4 |
| 48 | CTPY | COURTESY TRANSPORTATION INC | | | SCAC3 |
