| 1 | DY | Norwegian Air Shuttle A.S. t/a Norwegian | ICAO: NAX, Callsign: Nor Shuttle, IATA Prefix: 328, IATA designator changed from N8. IATA designator changed to DY. | N | AVCODES |
| 2 | DY | Air Djibouti | ICAO: DJU, Callsign: Air Djib, Established in 1963, ceased all operations in 1991. | DJI | AVCODES |
| 3 | DY | Norwegian Air Shuttle A.S. t/a Norwegian | ICAO: NAX, Callsign: Nor Shuttle, IATA Prefix: 328, IATA designator changed from DY*. IATA designator previously changed from N8. | N | AVCODES |
| 4 | DYA | Dynamic Aviation, LLC d/b/a Dynamic International Airways | IATA: 2D, Callsign: Dynamic Air, IATA Prefix: 054, Name changed to Dynamic International Airways, LLC. Founded in 2010. | USA | AVCODES |
| 5 | DYA | Dynamic International Airways, LLC | IATA: 2D, Callsign: Dynamic Air, IATA Prefix: 054, Name changed to Eastern Airlines, LLC w.e.f. 25 June 2018. Name changed from Dynamic Aviation, LLC d/b/a Dynamic International Airways. Founded in 2010. | USA | AVCODES |
| 6 | DYAC | DIAMOND HEAVY HAUL INC | | | SCAC4 |
| 7 | DYAL | DAYAL TRANSPORT SYSTEMS INC | | | SCAC4 |
| 8 | DYAM | DYAM TRANSPORT INC | | | SCAC4 |
| 9 | DYAN | DYNAMIC AVIATION | | | SCAC4 |
| 10 | DYAS | DYNAMO EXPRESS | | | SCAC4 |
| 11 | DYCC | DYNAMIC CLOSURES CORPORATION | | | SCAC4 |
| 12 | DYCI | DYNASTY CUSTOMS BROKER INC | | | SCAC4 |
| 13 | DYCK | DYCKS OIL & AUTO INC | | | SCAC4 |
| 14 | DYCP | DYMONDS CONCRETE PRODUCTS INC | | | SCAC4 |
| 15 | DYCR | DAYBREAK CHARTERS | | | SCAC4 |
| 16 | DYCT | DYNAMIC TRANSIT COMPANY | | | SCAC4 |
| 17 | DYCU | DYCKERHOFF GMBH | | D | BIC |
| 18 | DYCV | DAISY GARDEN RESTAURANT | | | SCAC4 |
| 19 | DYDB | DAY, DARREN LLC | | | SCAC4 |
| 20 | DYDI | DYNAMIC DITCHERS INC | | | SCAC4 |
| 21 | DYDL | DYNAMIC DELIVERY, INC | | | SCAC1 |
| 22 | DYDL | DYNAMIC DELIVERY INC | | | SCAC4 |
| 23 | DYDN | DYNAMIC DISTRIBUTION LLC | | | SCAC4 |
| 24 | DYDO | DAYSPRING TRANSPORTATION INC | | | SCAC4 |
| 25 | DYDS | DYNAMIC DELIVERY SERVICES INC | | | SCAC4 |
| 26 | DYDT | DRYSDALE TRUCKING | | | SCAC4 |
| 27 | DYE | Dynamic Air | Callsign: Dynamic, Founded in 1980. Ceased operations. ICAO callsign changed from Dynamite | NL | AVCODES |
| 28 | DYE | Dynamic Air | Callsign: Dynamite, ICAO callsign changed to Dynamic | NL | AVCODES |
| 29 | DYE | Dynamic Air | | | ICAO1 |
| 30 | DYEC | DAISY EXPRESS INC | | | SCAC4 |
| 31 | DYED | DIXIE FREIGHT SYSTEMS INC | | | SCAC4 |
| 32 | DYEF | DAISY LIMITED | | | SCAC4 |
| 33 | DYFA | DYNAMIC FAITH S A | | | SCAC4 |
| 34 | DYFC | DAILY FREIGHT CARGO CORP | | | SCAC4 |
| 35 | DYFS | DYNAMIC FREIGHT SOLUTIONS INC | | | SCAC4 |
| 36 | DYGC | DIY GROUP INC | | | SCAC4 |
| 37 | DYII | DYNASTY INTERNATIONAL INC | | | SCAC4 |
| 38 | DYJK | DYER, JEFF TRUCKING | | | SCAC4 |
| 39 | DYJT | DAYJO TRANSPORT INC | | | SCAC4 |
| 40 | DYKC | DYNAMITE TRUCKING LLC | | | SCAC4 |
| 41 | DYKE | DYKES, RICK HAULING LTD | | | SCAC4 |
| 42 | DYKG | DYKEMAN, GERALD F LIMITED | | | SCAC4 |
| 43 | DYKI | DESTINY TRUCKING | | | SCAC4 |
| 44 | DYKL | DYNAMIK TRANSPORT LLC | | | SCAC4 |
| 45 | DYKM | DYKSTRA TRUCKING INC | | | SCAC4 |
| 46 | DYKN | DYKMAN TRUCKING | | | SCAC4 |
| 47 | DYKT | DYKMAN CATTLE CO LTD | | | SCAC4 |
| 48 | DYLE | DOYLE, T M TEAMING INC | | | SCAC4 |
| 49 | DYLG | DYNA LOGISTICS INC | | | SCAC4 |
| 50 | DYLK | DYNALINK SYSTEMS INC | | | SCAC4 |
| 51 | DYLL | DESTINY LOGISTICS LLC | | | SCAC4 |
| 52 | DYLS | DYNAMIC LOGISTIC SYSTEMS LLC | | | SCAC4 |
| 53 | DYLT | DAYLIGHT TRANSPORT, INC | | | SCAC1 |
| 54 | DYLT | DAYLIGHT TRANSPORT LLC | | | SCAC4 |
| 55 | DYLU | DONGYOUNG SHIPPING CO.,LTD | | ROK | BIC |
| 56 | DYLU | DYCKERHOFF AG | | | SCAC4 |
| 57 | DYLX | Ronald L. Boothman Remainder Trust | added 4/1984; eliminated 4/1985 | | NAKINA |
| 58 | DYLX | Transportation Equipment, Inc. | added 4/1985; 1/1994-7/2000; eliminated 1/2005; 7/2005 (not listed) | | NAKINA |
| 59 | DYLX | Manufacturers Leasing Corp. | added 1/1962; 7/1965-1/1980; eliminated 4/1984 | | NAKINA |
| 60 | DYLX | Koppers Co., Inc. | eliminated 1/1962 | | NAKINA |
| 61 | DYLX | Manufacturers Leasing Corp. | 4/1961 | | NAKINA |
| 62 | DYLX | Koppers Co., Inc. | added 7/1959 | | NAKINA |
| 63 | DYLX | Koppers Co., Inc. | added 7/59 | | NRHS |
| 64 | DYLX | Manufacturers Leasing Corp. | Apr-61 | | NRHS |
| 65 | DYLX | Koppers Co., Inc. | eliminated 1/62 | | NRHS |
| 66 | DYLX | Manufacturers Leasing Corp. | added 1/62; 7/65-1/80; eliminated 4/84 | | NRHS |
| 67 | DYLX | Ronald L. Boothman Remainder Trust | added 4/84; eliminated 4/85 | | NRHS |
| 68 | DYLX | Transportation Equipment, Inc. | added 4/85; 1/94-7/2000 | | NRHS |
| 69 | DYLX | *KOPPERS CO. (MANUFACTURERS LEASINGCORP.) | | | PWRC |
| 70 | DYLX | +RONALD L. BOOTHMAN REMAINDER TRUST (TEIX) (TRANSPORTATION EQUIPMENT, INC.) | | | PWRC |
| 71 | DYLX | Ronald L. Boothman Remainder Trust | | | RSRV |
| 72 | DYLX | TRANSPORTATION EQUIPMENT, INC. | | | SCAC4 |
| 73 | DYM | Dynamic Air, S.L. | Callsign: Dynamic Sky, | E | AVCODES |
| 74 | DYMB | DURYEA MOTOR CARRIERS | | | SCAC4 |
| 75 | DYME | DYNAMIC ENGINEERING INC | | | SCAC4 |
| 76 | DYMH | DYNAMICS FREIGHT | | | SCAC4 |
| 77 | DYMK | DYKEMA TRUCKING INC | | | SCAC4 |
| 78 | DYMR | DYNAMIC TRANSPORTATION LLC | | | SCAC4 |
| 79 | DYMT | DYNASTY MARINE TRANSPORTATION INC | | | SCAC4 |
| 80 | DYMU | DANMAR LOGISTICA CRYO SL | | | SCAC4 |
| 81 | DYN | Aero Dynamics, Inc. | Callsign: Aero Dynamic, Name changed to Aerodynamics, Inc. ICAO callsign changed to Aerodynamics | USA | AVCODES |
| 82 | DYN | Aerodynamics, Inc. | IATA: Y7, Callsign: Aerodynamics, IATA designator changed to 8N*. Name changed from Aero Dynamics, Inc. ICAO callsign from Aero Dynamic | USA | AVCODES |
| 83 | DYN | Aerodynamics, Inc. | IATA: 8N, Callsign: Aerodynamics, Designator changed to 4A. Name changed from Aero Dynamics, Inc. ICAO callsign from Aero Dynamic. IATA designator changed from Y7*. | USA | AVCODES |
| 84 | DYN | Aerodynamics, Inc. | IATA: 4A, Callsign: Aerodynamics, Designator changed from 8N*. Name changed to Aerodynamics, Inc. d/b/a Great Lakes Jet Express. Name changed from Aero Dynamics, Inc. ICAO callsign from Aero Dynamic. IATA designator changed from Y7*. | USA | AVCODES |
| 85 | DYN | Aerodynamics, Inc. d/b/a Great Lakes Jet Express | Callsign: Aerodynamics, Designator changed from 8N*. Name changed to Aerodynamics, Inc. d/b/a Great Lakes Jet Express. Name changed from Aero Dynamics, Inc. ICAO callsign from Aero Dynamic. IATA designator changed from Y7*. | USA | AVCODES |
| 86 | DYN | Aero Dynamics | | | ICAO1 |
| 87 | DYNA | DYNA BULK INC | | | SCAC4 |
| 88 | DYNB | DYNA FREIGHT INC | | | SCAC4 |
| 89 | DYND | DYNAMO DELIVERY | | | SCAC4 |
| 90 | DYNE | DYNAMEX CANADA LIMITED | | | SCAC4 |
| 91 | DYNH | DYNAMITE TRANSPORTATION INC | | | SCAC4 |
| 92 | DYNM | DYNAMIC CARRIER SERVICES LLC | | | SCAC4 |
| 93 | DYNN | DYNAMO PLAYGROUNDS | | | SCAC4 |
| 94 | DYNO | DYNO TRANSPORTATION, INC | | | SCAC1 |
| 95 | DYNP | DYNAMIC INDUSTRIAL SUPPLY | | | SCAC4 |
| 96 | DYNQ | DYNASTY KITCHEN CABINETS LTD | | | SCAC4 |
| 97 | DYNR | DYNO NOBEL TRANSPORTATION INC | | | SCAC4 |
| 98 | DYNS | DYNASTY TRANSPORTATION, INC. | | | SCAC1 |
| 99 | DYNS | DYNASTY TRANSPORTATION LLC (N/K/A U | | | SCAC4 |
| 100 | DYNT | DYNAMIC TRANSPORT | | | SCAC4 |
