| 1 | CYC | Cyprair Tours Ltd. | Callsign: Cyprair, Designator CB recalled by IATA | CY | AVCODES |
| 2 | CYC | Cyprair Tours Ltd. | IATA: CB, Callsign: Cyprair, Designator CB recalled by IATA | CY | AVCODES |
| 3 | CYC | Cyprair Tours | | | ICAO1 |
| 4 | CYCA | CRYSTAL COAST TRANSPORT INC | | | SCAC3 |
| 5 | CYCAS | CYCASA CANTERAS Y CONSTRUCCIONES, S.A. | | ES | VKM |
| 6 | CYCB | COMMUNITY CHARTER BUS CORPORATION | | | SCAC3 |
| 7 | CYCB | CENTURY CARRIERS INC | | | SCAC4 |
| 8 | CYCC | CITY CARTAGE CO | | | SCAC3 |
| 9 | CYCC | CRYSTAL ICE COMPANY | | | SCAC4 |
| 10 | CYCD | CYCLADES SHIPPING COMPANY LIMITED | | | SCAC3 |
| 11 | CYCE | CYCLONE EXPRESS INC | | | SCAC3 |
| 12 | CYCE | CYCLE UP SUPPLY CHAIN | | | SCAC4 |
| 13 | CYCF | CAMIONNAGE YVAN CONSTANTINEAU INC | | | SCAC4 |
| 14 | CYCH | COUNTRY CANDLE CO INC | | | SCAC4 |
| 15 | CYCI | CRYSTAL CLEAR INDUSTRIES | | | SCAC3 |
| 16 | CYCJ | CYCLONE TRANSPORTATION SERVICES INC | | | SCAC4 |
| 17 | CYCK | CHERRY CLASSICS | | | SCAC4 |
| 18 | CYCM | COUNTRY CAMPERS SALES LTD | | | SCAC4 |
| 19 | CYCN | COUNTY CAB SERVICE INC | | | SCAC3 |
| 20 | CYCN | CLAY CARRIERS INC | | | SCAC4 |
| 21 | CYCO | COYOTE COACH EXPRESS | | | SCAC3 |
| 22 | CYCO | CITY CARGO INC | | | SCAC4 |
| 23 | CYCP | CITY CAB | | | SCAC3 |
| 24 | CYCQ | CENTURY CARTAGE COMPANY INC | | | SCAC3 |
| 25 | CYCR | CYCLONE TRANSPORT | | | SCAC4 |
| 26 | CYCS | CITY CARTAGE SERVICE INC | | | SCAC3 |
| 27 | CYCU | TRANSPLANNER SP ZOO | | PL | BIC |
| 28 | CYCV | CRYSTAL COURIER SERVICE INC | | | SCAC3 |
| 29 | CYCV | CYCLE COUNTRY ACCESSORIES CORP | | | SCAC4 |
| 30 | CYCX | Cyanamid of Canada Ltd. | added 7/1958; 4/1961-1/1980; eliminated 10/1981 | | NAKINA |
| 31 | CYCX | General American Transportation Corp. | 1/1946-10/1957; eliminated 7/1958 | | NAKINA |
| 32 | CYCX | Pennsylvania-Conley Tank Line, a Division of General American Transportation Corp. | 7/1937-1/1945 | | NAKINA |
| 33 | CYCX | Conley Tank Car Co. (Pennsylvania-Conley Tank Car Co.) | 7/1935 | | NAKINA |
| 34 | CYCX | Conley Tank Car Co. (Pennsylvania-Conley Tank Line) | 7/1932 | | NAKINA |
| 35 | CYCX | Conley Tank Car Co. | 8/1920-7/1930 | | NAKINA |
| 36 | CYCX | Conley Tank Car Co. (Pennsylvania-Conley Tank Line, a Division of General American Transportation Corp.) | Apr-38 | | NRHS |
| 37 | CYCX | General American Transportation Corp. | 1/52-10/57; eliminated 7/58 | | NRHS |
| 38 | CYCX | Cyanamid of Canada Ltd. | added 7/58; 4/61-1/80; eliminated 10/81 | | NRHS |
| 39 | CYCX | *(GATC) PENNSYLVANIA - CONLEY TANK LINE | | | PWRC |
| 40 | CYCX | *CYANAMID OF CANADA LTD. | | | PWRC |
| 41 | CYCX | CYANAMID OF CANADA LTD | | | SCAC3 |
| 42 | CYCX | CYANAMID OF CANADA LTD | | | SCAC4 |
| 43 | CYCY | Crystal City R.R., Inc. | 1/1994-7/2005 | | NAKINA |
| 44 | CYCY | Crystal City R.R., Inc. | 1/94-7/2000 | | NRHS |
| 45 | CYCY | CRYSTAL CITY RAILROAD, INC. | | | PWRC |
| 46 | CYCY | Crystal City Railroad | | | RSRV |
| 47 | CYCY | CRYSTAL CITY RAILROAD INC | | | SCAC3 |
| 48 | CYCY | CRYSTAL CITY RAILROAD INC | | | SCAC4 |
