| 3601 | OTCP | OWENS, T C TRUCKING CO INC | | | SCAC3 |
| 3602 | OTCQ | OSBORNE TRUCKING COMPANY | | | SCAC3 |
| 3603 | OTCR | Oakdale Traction Corp. | 7/2005 | | NAKINA |
| 3604 | OTCR | OAKDALE TRACTION CORPORATION | | | PWRC |
| 3605 | OTCR | Oakdale Traction Corporation | | | RSRV |
| 3606 | OTCR | OAKDALE TRACTION CORPORATION | | | SCAC4 |
| 3607 | OTCT | OTC TRANSPORT CORPORATION | | | SCAC3 |
| 3608 | OTCT | Oil Terminal Constanta | | RO | TRAFFIC |
| 3609 | OTCV | OTC TRANSPORTATION SERVICES INC | | | SCAC4 |
| 3610 | OTCY | OLYMPIC TRANSPORT COMPANY INC | | | SCAC3 |
| 3611 | OTDA | ON THE DOUBLE AIR EXPRESS INC | | | SCAC3 |
| 3612 | OTDI | O T D INC | | | SCAC3 |
| 3613 | OTDN | ON-TIME DELIVERY INC | | | SCAC4 |
| 3614 | OTDQ | ON TIME DELIVERY | | | SCAC4 |
| 3615 | OTDR | OUTDOOR TRADITION TOURS INC | | | SCAC3 |
| 3616 | OTDS | ON TIME DELIVERY INC | | | SCAC4 |
| 3617 | OTDV | O T DELIVERY SYSTEMS INC | | | SCAC3 |
| 3618 | OTDV | O T DELIVERY SYSTEMS INC | | | SCAC4 |
| 3619 | OTDW | ON THE DOUBLE WORLDWIDE COURIER LTD | | | SCAC3 |
| 3620 | OTDW | OTD LOGISTICS INCORPORATED | | | SCAC4 |
| 3621 | OTDX | Greenbrier Management Services, LLC | added 7/2005; 7/2005 | | NAKINA |
| 3622 | OTDX | Greenbrier Leasing Corp. | added 1/1980; 1/1980-7/2000; eliminated 7/2005 | | NAKINA |
| 3623 | OTDX | O-T-D Corp. | added 4/1958; 4/1961-1/1975; eliminated 1/1980 | | NAKINA |
| 3624 | OTDX | O-T-D Corp. | 4/61-1/75; eliminated 1/80 | | NRHS |
| 3625 | OTDX | Greenbrier Leasing Corp. | added 1/80; 1/80-7/2000 | | NRHS |
| 3626 | OTDX | *O-T-D CORP. | | | PWRC |
| 3627 | OTDX | +GREENBRIER MANAGEMENT SERVICES [GREENBRIER LEASING CORPORATION]) | | | PWRC |
| 3628 | OTDX | Greenbrier Leasing Corporation | | | RSRV |
| 3629 | OTDX | O-T-D CORP | | | SCAC3 |
| 3630 | OTDX | GREENBRIER MANAGEMENT SERVICES LLC | | | SCAC4 |
| 3631 | OTDY | ON TIME DELIVERY INC | | | SCAC3 |
| 3632 | OTE | BAe Military Division Warton | Callsign: Octane, | GB | AVCODES |
| 3633 | OTEB | ONE TWO SIX SEVEN EIGHT SEVEN THREE | | | SCAC4 |
| 3634 | OTEE | ONE THREE EIGHT SIX NINE N | | | SCAC4 |
| 3635 | OTEG | ON-TIME EXPRESS & LOGISTICS INC | | | SCAC4 |
| 3636 | OTEI | OTTER EXPRESS INC | | | SCAC3 |
| 3637 | OTEN | OSBURN TRUCKING ENTERPRISES INCORPO | | | SCAC3 |
| 3638 | OTEN | ONE TWO EIGHT EIGHT NINE FOUR FOUR | | | SCAC4 |
| 3639 | OTEQ | ON TIME EXPRESS INC | | | SCAC4 |
| 3640 | OTER | ON TRACK EXPRESS | | | SCAC4 |
| 3641 | OTES | ONTIME EXPEDITED SERVICES INC | | | SCAC3 |
| 3642 | OTEU | CAI INTERNATIONAL | | USA | BIC |
| 3643 | OTEU | CONSENT EQUIPMENT AB SWEDEN | | | SCAC3 |
| 3644 | OTEU | CONSENT EQUIPMENT AB | | | SCAC4 |
| 3645 | OTEV | OP-TECH ENVIRONMENTAL SERVICES INC | | | SCAC4 |
| 3646 | OTEW | ON TIME EXPRESS INC | | | SCAC4 |
| 3647 | OTEX | Otex Tank Car Co. | 1/1943-1/1946 | | NAKINA |
| 3648 | OTEX | OTEX TANK CAR CO. | | | PWRC |
| 3649 | OTEX | Optima Express | | BG | TRAFFIC |
| 3650 | OTEX | Optima Tours BG /Oптима турс БГ | | BG | VKM |
| 3651 | OTF | orange2fly Airlines S.A. | IATA: O4, IATA Prefix: 919, Filed for bankruptcy protection on 20 October 2020. Founded in September 2015. Commenced operations on 20 July 2016. Ceased operations on 01 July 2020. | GR | AVCODES |
| 3652 | OTFB | ONE TWO FOUR THREE FIVE TWO ZERO (1 | | | SCAC4 |
| 3653 | OTFC | ON THE FRINGE CUSTOM LEATHER LTD | | | SCAC4 |
| 3654 | OTFD | ONE(1) TRADE FWDNG & SCM | | | SCAC4 |
| 3655 | OTFE | ONE TWO FOUR THREE FOUR EIGHT TWO ( | | | SCAC4 |
| 3656 | OTFG | OTTO FREIGHT SA DE CV | | | SCAC4 |
| 3657 | OTFK | OLDE TOWN FUEL CO INC | | | SCAC4 |
| 3658 | OTFN | ONTARIO BEST CARRIER INC | | | SCAC4 |
| 3659 | OTFQ | ONE THREE FIVE SIX NINE NINE FIVE ( | | | SCAC4 |
| 3660 | OTFS | ON TRACK FREIGHT SYSTEMS INC | | | SCAC4 |
| 3661 | OTFU | OTND ONET TECHNOLOGIES | | F | BIC |
| 3662 | OTFV | ONE THREE FIVE SEVEN TWO T | | | SCAC4 |
| 3663 | OTG | One Two Go Airlines Co. Ltd. | IATA: OG, IATA Prefix: 908, | T | AVCODES |
| 3664 | OTG | One Two Go Airlines | | | ICAO1 |
| 3665 | OTGA | ORTEGA TRUCKING | | | SCAC4 |
| 3666 | OTGB | ONE TWO THREE (123) LOGISTICS LTD | | | SCAC4 |
| 3667 | OTGK | ON THE GO KIDS INC | | | SCAC4 |
| 3668 | OTGO | ORTEGO OIL & SUPPLY CO INC | | | SCAC4 |
| 3669 | OTGW | ORIENT TIGER SCHIFFAHRTS-GESELLSCHA | | | SCAC4 |
| 3670 | OTHH | OTHELLO SHIPPING COMPANY S A | | | SCAC4 |
| 3671 | OTHK | ONE TOUCH TRUCKING | | | SCAC4 |
| 3672 | OTHL | OVER THE HILL TRUCKING INC | | | SCAC3 |
| 3673 | OTHO | ONE THOUSAND (1000) ISLANDS RV CENT | | | SCAC4 |
| 3674 | OTHP | OVER THE HILL TRANSPORT INC | | | SCAC3 |
| 3675 | OTHP | ON TIME HOT SHOT XPRESS INC | | | SCAC4 |
| 3676 | OTHR | ONE THREE THREE SEVEN EIGHT SEVEN N | | | SCAC4 |
| 3677 | OTHS | OTHONI SHIPPING CORP | | | SCAC3 |
| 3678 | OTIA | OCEAN TERMINALS INC | | | SCAC4 |
| 3679 | OTIB | OLSON TRADING INC | | | SCAC4 |
| 3680 | OTIC | OCILLA TRUCK AND IMPLEMENT COMPANY | | | SCAC3 |
| 3681 | OTIC | O T I CARGO INC | | | SCAC4 |
| 3682 | OTID | ON TIME DELIVERY | | | SCAC3 |
| 3683 | OTID | OATT TRANSPORT INC | | | SCAC4 |
| 3684 | OTIE | ON-TIME EXPRESS INC | | | SCAC4 |
| 3685 | OTIJ | OCEAN TRANSPORTATION INC | | | SCAC4 |
| 3686 | OTIK | OTIS TRUCKING CO INC | | | SCAC3 |
| 3687 | OTIK | OTIS TRUCKING CO INC | | | SCAC4 |
| 3688 | OTIM | ONTIME TRANSPORT INC | | | SCAC3 |
| 3689 | OTIM | ON TIME IMPORT EXPORT CORP | | | SCAC4 |
| 3690 | OTIQ | ONYX TRANSPORT INC | | | SCAC4 |
| 3691 | OTIS | OTIS TRANSFER | | | SCAC3 |
| 3692 | OTIY | ORTIZ TRANSPORT INC | | | SCAC4 |
| 3693 | OTJ | S.C. Ten Airways S.R.L. | IATA: X5, Callsign: Tender Air, | RO | AVCODES |
| 3694 | OTJS | OTOOLE, JOHN & SON INC | | | SCAC3 |
| 3695 | OTK | On-Track Aviation Ltd. | Callsign: On Track, | GB | AVCODES |
| 3696 | OTKA | ORION TANKERS LIMITED | | | SCAC4 |
| 3697 | OTKB | OTTOS TRUCKING | | | SCAC4 |
| 3698 | OTKC | OUR TRUCK CONTRACT CARRIERS | | | SCAC3 |
| 3699 | OTKC | OCEAN TANKERS INTERNATIONAL CO | | | SCAC4 |
| 3700 | OTKD | OETKER, DR AUGUST KG | | | SCAC3 |
