| 1 | CY | Cyprus Airways Ltd. | ICAO: CYP, Callsign: Cyprus, IATA Prefix: 048, Ceased operation on 09 January 2015. | CY | AVCODES |
| 2 | CY | Charlie Airlines Ltd. t/a Cyprus Airways | ICAO: CYP, Callsign: Cyprus, IATA Prefix: 078, Parent company S7 Airlines (Russia). Commenced opeations on 01 June 2017. AOC granted 14 March 2017. | CY | AVCODES |
| 3 | CY | CITY OF YAKIMA | | | PWRC |
| 4 | CYA | Cheyenne Airways, Inc. | Callsign: Cheyenne Air, | USA | AVCODES |
| 5 | CYA | Cheyenne Airways | | | ICAO1 |
| 6 | CYA | CRYSTAL TRANSPORTATION INC | | | SCAC4 |
| 7 | CYAB | CARRY-ALL BROKERAGE INC | | | SCAC3 |
| 8 | CYAC | CARTY & CARTY INC | | | SCAC3 |
| 9 | CYAE | CYA ENTERPRISES | | | SCAC3 |
| 10 | CYAF | CITY AIR FREIGHT, INC | | | SCAC3 |
| 11 | CYAK | CARRY ALL TRUCKING INC | | | SCAC4 |
| 12 | CYAL | CARRY ALL VAN LINES | | | SCAC3 |
| 13 | CYAN | COSTLEY, ANDY TRUCKING | | | SCAC3 |
| 14 | CYAN | COUNTRY MFG | | | SCAC4 |
| 15 | CYAP | CHANEYS ASPHALT PAVING COMPANY | | | SCAC3 |
| 16 | CYAR | CAYUGA AIR FREIGHT | | | SCAC3 |
| 17 | CYAS | CLENSY & SON TRANSPORTATION | | | SCAC3 |
| 18 | CYAU | CYANCO INTERNATIONAL,LLC | | USA | BIC |
| 19 | CYAU | Cyanco International | | | RSRV |
| 20 | CYB | City Air Bus Ltd. | Callsign: Citybus, | GB | AVCODES |
| 21 | CYB | CHIPPEWA YELLOW BUS CO INC | | | SCAC4 |
| 22 | CYBE | CYBEREX SERIVCE CORP | | | SCAC3 |
| 23 | CYBE | CYBER TRUCK CARRIERS INC | | | SCAC4 |
| 24 | CYBI | COLEY, BUD TRUCKING INC | | | SCAC4 |
| 25 | CYBL | CRYSTAL BLUE LINES INC | | | SCAC3 |
| 26 | CYBS | COWBOY EXPRESS INC | | | SCAC4 |
| 27 | CYBY | CYBER TRANSFER LTD | | | SCAC4 |
| 28 | CYC | Cyprair Tours Ltd. | Callsign: Cyprair, Designator CB recalled by IATA | CY | AVCODES |
| 29 | CYC | Cyprair Tours Ltd. | IATA: CB, Callsign: Cyprair, Designator CB recalled by IATA | CY | AVCODES |
| 30 | CYC | Cyprair Tours | | | ICAO1 |
| 31 | CYCA | CRYSTAL COAST TRANSPORT INC | | | SCAC3 |
| 32 | CYCAS | CYCASA CANTERAS Y CONSTRUCCIONES, S.A. | | ES | VKM |
| 33 | CYCB | COMMUNITY CHARTER BUS CORPORATION | | | SCAC3 |
| 34 | CYCB | CENTURY CARRIERS INC | | | SCAC4 |
| 35 | CYCC | CITY CARTAGE CO | | | SCAC3 |
| 36 | CYCC | CRYSTAL ICE COMPANY | | | SCAC4 |
| 37 | CYCD | CYCLADES SHIPPING COMPANY LIMITED | | | SCAC3 |
| 38 | CYCE | CYCLONE EXPRESS INC | | | SCAC3 |
| 39 | CYCE | CYCLE UP SUPPLY CHAIN | | | SCAC4 |
| 40 | CYCF | CAMIONNAGE YVAN CONSTANTINEAU INC | | | SCAC4 |
| 41 | CYCH | COUNTRY CANDLE CO INC | | | SCAC4 |
| 42 | CYCI | CRYSTAL CLEAR INDUSTRIES | | | SCAC3 |
| 43 | CYCJ | CYCLONE TRANSPORTATION SERVICES INC | | | SCAC4 |
| 44 | CYCK | CHERRY CLASSICS | | | SCAC4 |
| 45 | CYCM | COUNTRY CAMPERS SALES LTD | | | SCAC4 |
| 46 | CYCN | COUNTY CAB SERVICE INC | | | SCAC3 |
| 47 | CYCN | CLAY CARRIERS INC | | | SCAC4 |
| 48 | CYCO | COYOTE COACH EXPRESS | | | SCAC3 |
| 49 | CYCO | CITY CARGO INC | | | SCAC4 |
| 50 | CYCP | CITY CAB | | | SCAC3 |
| 51 | CYCQ | CENTURY CARTAGE COMPANY INC | | | SCAC3 |
| 52 | CYCR | CYCLONE TRANSPORT | | | SCAC4 |
| 53 | CYCS | CITY CARTAGE SERVICE INC | | | SCAC3 |
| 54 | CYCU | TRANSPLANNER SP ZOO | | PL | BIC |
| 55 | CYCV | CRYSTAL COURIER SERVICE INC | | | SCAC3 |
| 56 | CYCV | CYCLE COUNTRY ACCESSORIES CORP | | | SCAC4 |
| 57 | CYCX | Cyanamid of Canada Ltd. | added 7/1958; 4/1961-1/1980; eliminated 10/1981 | | NAKINA |
| 58 | CYCX | General American Transportation Corp. | 1/1946-10/1957; eliminated 7/1958 | | NAKINA |
| 59 | CYCX | Pennsylvania-Conley Tank Line, a Division of General American Transportation Corp. | 7/1937-1/1945 | | NAKINA |
| 60 | CYCX | Conley Tank Car Co. (Pennsylvania-Conley Tank Car Co.) | 7/1935 | | NAKINA |
| 61 | CYCX | Conley Tank Car Co. (Pennsylvania-Conley Tank Line) | 7/1932 | | NAKINA |
| 62 | CYCX | Conley Tank Car Co. | 8/1920-7/1930 | | NAKINA |
| 63 | CYCX | Conley Tank Car Co. (Pennsylvania-Conley Tank Line, a Division of General American Transportation Corp.) | Apr-38 | | NRHS |
| 64 | CYCX | General American Transportation Corp. | 1/52-10/57; eliminated 7/58 | | NRHS |
| 65 | CYCX | Cyanamid of Canada Ltd. | added 7/58; 4/61-1/80; eliminated 10/81 | | NRHS |
| 66 | CYCX | *(GATC) PENNSYLVANIA - CONLEY TANK LINE | | | PWRC |
| 67 | CYCX | *CYANAMID OF CANADA LTD. | | | PWRC |
| 68 | CYCX | CYANAMID OF CANADA LTD | | | SCAC3 |
| 69 | CYCX | CYANAMID OF CANADA LTD | | | SCAC4 |
| 70 | CYCY | Crystal City R.R., Inc. | 1/1994-7/2005 | | NAKINA |
| 71 | CYCY | Crystal City R.R., Inc. | 1/94-7/2000 | | NRHS |
| 72 | CYCY | CRYSTAL CITY RAILROAD, INC. | | | PWRC |
| 73 | CYCY | Crystal City Railroad | | | RSRV |
| 74 | CYCY | CRYSTAL CITY RAILROAD INC | | | SCAC3 |
| 75 | CYCY | CRYSTAL CITY RAILROAD INC | | | SCAC4 |
| 76 | CYD | Access Air, Inc. | IATA: ZA, Callsign: Cyclone, Ceased operations on 27 February 2001. Operations to start again as Iowair 05/2000 | USA | AVCODES |
| 77 | CYD | Access Air | IATA: ZA | | ICAO1 |
| 78 | CYDA | CENTURY DEDICATED INC | | | SCAC4 |
| 79 | CYDB | CENTURY DISTRIBUTING CO | | | SCAC3 |
| 80 | CYDC | CLOYD, CLIFTON JEROME | | | SCAC3 |
| 81 | CYDD | CYCLONE DIAMOND PRODUCTS LTD | | | SCAC4 |
| 82 | CYDI | CYPERT, DALE TRUCKING | | | SCAC3 |
| 83 | CYDI | CYPRESS DISTRIBUTORS | | | SCAC4 |
| 84 | CYDP | CYCLE DISPATCH AND DELIVERY INC | | | SCAC3 |
| 85 | CYDP | CYCLE LOGISTICS INC | | | SCAC4 |
| 86 | CYDQ | CITY DELIVERY SYSTEM | | | SCAC3 |
| 87 | CYDS | CLYDES CARTAGE C0 | | | SCAC3 |
| 88 | CYDU | SIL | | F | BIC |
| 89 | CYDV | CARRY TRANSIT (DTL DIVISION) | | | SCAC4 |
| 90 | CYDX | Conrad Yelvington Distributors, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 91 | CYDX | Northbrook Corp. | 1/1994 (not listed) | | NAKINA |
| 92 | CYDX | Northbrook Corp. | Jan-94 | | NRHS |
| 93 | CYDX | Conrad Yelvington Distributors, Inc. | Jul-00 | | NRHS |
| 94 | CYDX | *NORTHBROOK CORPORATION | | | PWRC |
| 95 | CYDX | +CONRAD YELVINGTON DISTRIBUTORS INC. | | | PWRC |
| 96 | CYDX | Conrad Yelvington Distributors | | | RSRV |
| 97 | CYDZ | CONRAD YELVINGTON DISTRIBUTORS, INC. | | | PWRC |
| 98 | CYE | Aerocheyenne, S.A. de C.V. | Callsign: Aerocheyenne, | MEX | AVCODES |
| 99 | CYE | Ordos General Aviation Co., Ltd. | Callsign: Sakira, | PRC | AVCODES |
| 100 | CYE | Aerocheyenne | | | ICAO1 |
