| 1 | OLT | OLT-Ostfriesische Lufttransport | IATA: OL, Callsign: Oltra, IATA Prefix: 704, Name changed to OLT Express Germany GmbH. | D | AVCODES |
| 2 | OLT | OLT Express Germany GmbH | IATA: OL, Callsign: Oltra, IATA Prefix: 704, Ceased operations on 27 January 2013 at 12:00pm. Name changed from OLT-Ostfriesische Lufttransport. | D | AVCODES |
| 3 | OLT | Ostfriesische Lufttransport | IATA: OL | | ICAO1 |
| 4 | OLT | OLTCHIM SA | | RO | VKM |
| 5 | OLTA | OCEANLINK/TOPAIR INTERNATIONAL CO L | | | SCAC4 |
| 6 | OLTB | OLSON TUG BOAT CO | | | SCAC3 |
| 7 | OLTC | OLIVER LUMBER COMPANY OF TORONTO LI | | | SCAC4 |
| 8 | OLTD | OPTIM LTD | | | SCAC4 |
| 9 | OLTE | OLSON, TED ENTERPRISES INC | | | SCAC3 |
| 10 | OLTE | ONLINE LOGISTICS TRANSPORT LLC | | | SCAC4 |
| 11 | OLTF | OLYMPIC TRANSFER CORP | | | SCAC4 |
| 12 | OLTG | OLIVER TRUCKING CORP | | | SCAC3 |
| 13 | OLTH | OLTHOFF INC | | | SCAC3 |
| 14 | OLTI | OLSON TRANSFER & STG INC | | | SCAC3 |
| 15 | OLTI | OLSON TRANSFER & STG INC | | | SCAC4 |
| 16 | OLTK | OLSEN TRUCKING | | | SCAC3 |
| 17 | OLTK | OLIVER TRUCKING | | | SCAC4 |
| 18 | OLTM | OLYMPIC TRAILER MOVERS | | | SCAC3 |
| 19 | OLTM | OLTMANN, D REEDEREI GMBH & CO KG | | | SCAC4 |
| 20 | OLTN | OLIVAS TRUCKING | | | SCAC3 |
| 21 | OLTN | OUILLETTE TRUCKING | | | SCAC4 |
| 22 | OLTO | OVERLAND TRANSPORT INC | | | SCAC3 |
| 23 | OLTP | OLSON TRANSPORTATION COMPANY INC | | | SCAC3 |
| 24 | OLTP | OLIVER TRANSPORT & LEASING INC | | | SCAC4 |
| 25 | OLTQ | OIL TRANSPORT INC | | | SCAC3 |
| 26 | OLTR | ONLINE TRUCKING INC | | | SCAC4 |
| 27 | OLTS | OLINGER TRUCK SERVICE | | | SCAC3 |
| 28 | OLTS | ONLINE TRANSPORT SYSTEM INC | | | SCAC4 |
| 29 | OLTU | ODYSSEY FOODTRANS | | USA | BIC |
| 30 | OLTU | OCEANS LEASING & LOGISTICS LTD | | | SCAC3 |
| 31 | OLTV | O L TRUCKING | | | SCAC3 |
| 32 | OLTW | OLYMPIA TOWING CO | | | SCAC3 |
| 33 | OLTX | Overland Tank Car Co. | 4/1947 | | NAKINA |
| 34 | OLTX | OVERLAND TANK CAR CO. | | | PWRC |
