| 1 | OV | Estonian Air | ICAO: ELL, Callsign: Estonian, IATA Prefix: 960, Ceased operations on 08 November 2015. | EST | AVCODES |
| 2 | OV | Aeromaritime | ICAO: QKL, Callsign: Aeromar, Merged into UTA | F | AVCODES |
| 3 | OV | Overseas National Airlines, Inc. | Callsign: Onair, | USA | AVCODES |
| 4 | OV | SalamAir | ICAO: OMS, Callsign: Mazoon, | OM | AVCODES |
| 5 | OV | OTTER VALLEY RAIL ROAD | | | PWRC |
| 6 | OV | OTTER VALLEY RAIL ROAD | | | SCAC4 |
| 7 | OVA | aeronova S.L.U. d/b/a Air Europa Express | IATA: X5, Callsign: Aeronova, | E | AVCODES |
| 8 | OVA | Aero Nova | | | ICAO1 |
| 9 | OVA | Air Europa Express | | E | TRAFFIC |
| 10 | OVAF | OVAIR FREIGHT SERVICE INC | | | SCAC3 |
| 11 | OVAG | Oberbergische Verkehrs-AG Gummersbach | City: Gummersbach | D | TRAFFIC |
| 12 | OVAKO | Ovako Bar OY | | FI | VKM |
| 13 | OVAL | OVAL FRAMECRAFT INC | | | SCAC4 |
| 14 | OVB | Offenbacher Verkehrs-Betriebe GmbH | City: Offenbach am Main | D | TRAFFIC |
| 15 | OVBK | OVERSEAS BULKTANK CORPORATION | | | SCAC3 |
| 16 | OVBO | OVERMYER DISTRIBUTION SERVICES | | | SCAC3 |
| 17 | OVBO | OVERWEIGHT CONTAINER LOGISTICS CO | | | SCAC4 |
| 18 | OVBT | OVERBAY TRUCKING CO | | | SCAC3 |
| 19 | OVBT | OVERBYE LOGISTICS INC | | | SCAC4 |
| 20 | OVC | Aerovic C.A. | | EC | AVCODES |
| 21 | OVC | Aerovic | | | ICAO1 |
| 22 | OVCB | OVERCASH, BRADY INC | | | SCAC3 |
| 23 | OVCB | OVERWEST SAW & USED EQUIPMENT SALES | | | SCAC4 |
| 24 | OVCC | OVERSEAS CASCADE LLC | | | SCAC4 |
| 25 | OVCD | OVERHAUL VENTURES CORP | | | SCAC4 |
| 26 | OVCI | OVERSEAS CARRIERS INC | | | SCAC4 |
| 27 | OVCL | OVERLAND CARRIER LTD | | | SCAC3 |
| 28 | OVCL | OVER TRANSPORT | | | SCAC4 |
| 29 | OVCN | OVERLAND CONSTRUCTION SERVICES | | | SCAC3 |
| 30 | OVCO | OVERLAND CONTAINER TRANSPORTATION S | | | SCAC4 |
| 31 | OVCP | OVERSEAS VENTURE CONTAINER LINES | | | SCAC4 |
| 32 | OVCQ | OVERLAND TRANSPORTATION SYSTEM, INC | | | SCAC3 |
| 33 | OVCQ | OVERLAND TRANSPORTATION SYSTEMS INC | | | SCAC4 |
| 34 | OVCR | OLIVECROWN SHIPPING COMPANY LTD. | | | SCAC3 |
| 35 | OVCS | OVERSEAS COSMOS INC | | | SCAC3 |
| 36 | OVCS | OVERSEAS CARGO SERVICES INC | | | SCAC4 |
| 37 | OVCU | OVERSEAS CONTAINERS LIMITED | | | SCAC3 |
| 38 | OVCU | OVERSEAS CONTAINERS LIMITED | | | SCAC4 |
| 39 | OVD | State ATM Corporation | Callsign: Russia Corp, | RUS | AVCODES |
| 40 | OVDD | OVERLAND CARRIERS INC | | | SCAC3 |
| 41 | OVDK | OVERDRIVE TRUCKING INC | | | SCAC4 |
| 42 | OVDL | OVERLAND LOGISTICS LLC | | | SCAC4 |
| 43 | OVDQ | OVERLAND DELIVERY INC | | | SCAC3 |
| 44 | OVDR | OVERDRIVE TRUCKING INC | | | SCAC3 |
| 45 | OVDR | OVERDRIVE TRUCKING INC | | | SCAC4 |
| 46 | OVDS | OVERTON DISTRIBUTORS INC | | | SCAC3 |
| 47 | OVDY | OLIVA DELIVERY SERVICE INC | | | SCAC4 |
| 48 | OVE | Aeromover, S.A. de C.V. | Callsign: Aeromover, | MEX | AVCODES |
| 49 | OVE | Aeromover | | | ICAO1 |
| 50 | OVEA | OVERLAND WESTERN INTERNATIONAL, INC | | | SCAC3 |
| 51 | OVEA | OVERLAND WESTERN INTERNATIONAL INC | | | SCAC4 |
| 52 | OVEC | OVERLAND COURIER CORPORATION, THE | | | SCAC3 |
| 53 | OVED | OVERLAND CARRIERS INC | | | SCAC4 |
| 54 | OVEE | OVERNITE EXPRESS | | | SCAC3 |
| 55 | OVEE | OVERNITE EXPRESS | | | SCAC4 |
| 56 | OVEG | Ostbayerische Verwertungs und Enregieerzeugungsgesellschaft mbH | | DE | VKM |
| 57 | OVEH | OVERLAND EXPRESS RDC | | | SCAC3 |
| 58 | OVEK | OVERKAMP, PAT | | | SCAC3 |
| 59 | OVEL | OVERLAND MOVERS INC | | | SCAC3 |
| 60 | OVEL | OVERLAND MOVERS INC | | | SCAC4 |
| 61 | OVEN | OVERSEAS ENTERPRISES INC NEW JERSEY | | | SCAC3 |
| 62 | OVEN | OVERSEAS ENTERPRISES INC NEW JERSEY | | | SCAC4 |
| 63 | OVER | OVERNIGHT FREIGHT SERVICE, INC | | | SCAC3 |
| 64 | OVERGR | Walter Dengerfield Bus Company | City: London, Fleetname: Overground | GB | TRAFFIC |
| 65 | OVES | OVERSEA CARGO SERVICES INC | | | SCAC3 |
| 66 | OVET | OVERLAND TRAILS FREIGHT SYSTEMS INC | | | SCAC3 |
| 67 | OVEX | Ohio Valley Electric Co. | added 1/1997; 7/2000-7/2005 | | NAKINA |
| 68 | OVEX | Ohio Valley Electric Co. | added 1/97; 7/2000 | | NRHS |
| 69 | OVEX | OHIO VALLEY ELECTRIC COMPANY | | | PWRC |
| 70 | OVEX | Ohio Valley Electric | | | RSRV |
| 71 | OVEX | OHIO VALLEY ELECTRIC COMPANY | | | SCAC4 |
| 72 | OVF | Omnibusverkehr Franken GmbH | | D | TRAFFIC |
| 73 | OVFC | OVERSEAS FREIGHT CORP | | | SCAC3 |
| 74 | OVFL | OCEAN VIEW FISHERIES LTD | | | SCAC4 |
| 75 | OVFR | OVERSEAS FREIGHT INC | | | SCAC3 |
| 76 | OVFR | OVERSEAS FREIGHT INC | | | SCAC4 |
| 77 | OVGF | OUWENGA VEGETABLE & GRAIN FARM | | | SCAC3 |
| 78 | OVGI | OHIO VALLEY GOODWIL INDUSTRIES REHA | | | SCAC4 |
| 79 | OVGO | OVERLAND EXPRESS OF MICHIGAN INC | | | SCAC3 |
| 80 | OVHL | OVERHOLTS TRUCKING | | | SCAC3 |
| 81 | OVHO | OVERHOLTZER CHURCH FURNITURE INC | | | SCAC3 |
| 82 | OVHS | OVEN HEAD SALMON SMOKERS LTD | | | SCAC4 |
| 83 | OVHT | OVER-HAULERS TRUCKING INC | | | SCAC3 |
| 84 | OVI | Aerovias Ejecutivas, S.A. de C.V. | Callsign: Vias Ejecutivas, | MEX | AVCODES |
| 85 | OVI | Aerovias Ejecutivas | | | ICAO1 |
| 86 | OVIN | OPTEL VISION | | | SCAC4 |
| 87 | OVIT | OVITRANSPORT INC | | | SCAC4 |
| 88 | OVLA | OVERLAND EXPRESS INC | | | SCAC3 |
| 89 | OVLA | OVERLAND TRANSPORT AND LOGISTICS IN | | | SCAC4 |
| 90 | OVLC | OVERLAND CARRIER SERVICES INC | | | SCAC3 |
| 91 | OVLD | OVERLAND EXPRESS (DIV OF TNT CANADA | | | SCAC3 |
| 92 | OVLD | OVERLAND EXPRESS (DIV OF TST SOLUTI | | | SCAC4 |
| 93 | OVLE | OVIE LOGISTICS EXPRESS | | | SCAC4 |
| 94 | OVLG | OHIO VALLEY LEASING CO | | | SCAC3 |
| 95 | OVLG | OVIE LOGISTICS | | | SCAC4 |
| 96 | OVLI | OVERLAND INC | | | SCAC3 |
| 97 | OVLL | OVALTON LTD | | | SCAC3 |
| 98 | OVLL | OPTIVIA LLC | | | SCAC4 |
| 99 | OVLQ | OVER-LAND EXPRESS | | | SCAC3 |
| 100 | OVLR | OBERLANDER LITTLE ACERS INC | | | SCAC3 |
