| 1 | ARN | Air Canada Regional, Inc. | IATA: QK, Callsign: Transcan, IATA Prefix: 983, Name changed to Air Canada Jazz. ICAO Designator changed to JZZ. Name changed from Air Nova Inc. ICAO callsign changed from Nova. | CDN | AVCODES |
| 2 | ARN | Air Nova, Inc. | IATA: QK, Callsign: Nova, IATA Prefix: 983, Merged into Air Canada Regional Inc. during 2001. Air Canada Connector | CDN | AVCODES |
| 3 | ARN | Aviaservice | | AM | AVCODES |
| 4 | ARN | Astra Airlines SA | Callsign: Swisslease, | CH | AVCODES |
| 5 | ARN | Air Nova, Inc. | Callsign: Air Nova, ICAO callsign changed to Nova | CDN | AVCODES |
| 6 | ARN | Aeronexus Corporate Pty Ltd | IATA: RN, Callsign: Aeronex, IATA Prefix: 557, | ZA | AVCODES |
| 7 | ARN | Alberta RailNet, Inc. | 7/2000-7/2005 | | NAKINA |
| 8 | ARN | Canadian National Railways | added 7/2007 | | NAKINA |
| 9 | ARN | Albert RailNet, Inc. | Jul-00 | | NRHS |
| 10 | ARN | *ALBERT RAILNET, INC. | | | PWRC |
| 11 | ARN | CANADIAN NATIONAL RAILWAYS | | | PWRC |
| 12 | ARN | Alberta RailNet (Canadian National Railway) | | | RSRV |
| 13 | ARN | ALBERTA RAILNET INC | | | SCAC4 |
| 14 | ARN | Alberta RailNet | | CDN | TRAFFIC |
| 15 | ARNA | ARNOLD, A & SON TRANSFER & STORAGE | | | SCAC3 |
| 16 | ARNA | A ARNOLD WORLD CLASS RELOCATION | | | SCAC4 |
| 17 | ARNB | ARNOLD BROS TRANSPORT LTD | | | SCAC3 |
| 18 | ARNB | ARNOLD BROS TRANSPORT LTD | | | SCAC4 |
| 19 | ARNB | Arnold Brothers Transport Ltd. | | USA | TRAFFIC |
| 20 | ARNC | ARNEL COMPANY, THE | | | SCAC3 |
| 21 | ARNC | AMERICAN CALAN INC | | | SCAC4 |
| 22 | ARND | ARNOLD, AL, TRUCKING COMPANY | | | SCAC3 |
| 23 | ARND | ARENS INC | | | SCAC4 |
| 24 | ARNE | Arriva London North-East | | GB | TRAFFIC |
| 25 | ARNF | ARNOFF MOVING & STORAGE INC | | | SCAC3 |
| 26 | ARNF | ARNOFF MOVING & STORAGE INC | | | SCAC4 |
| 27 | ARNH | ARMENTA SEED COMPANY INC | | | SCAC4 |
| 28 | ARNI | ARGONNE NATIONAL LABORATORY | | | SCAC3 |
| 29 | ARNJ | ARNESON, JERRY INC | | | SCAC3 |
| 30 | ARNK | ARNOLD TRANSPORTATION | | | SCAC3 |
| 31 | ARNK | ARNETT TRUCKING CO | | | SCAC4 |
| 32 | ARNL | ARETHOUSA NAVIGATION CO. NICOSIA CY | | | SCAC3 |
| 33 | ARNM | AMADO ROJAS, NIVIA LUZMILA | | | SCAC4 |
| 34 | ARNN | ARANI NAVIGATION COMPANY | | | SCAC3 |
| 35 | ARNO | ARNOLD BROTHERS TRUCKING INC | | | SCAC3 |
| 36 | ARNO | Air Nova | Real: arn | CDN | TRAFFIC |
| 37 | ARNP | ARNIE ENTERPRISES INC | | | SCAC3 |
| 38 | ARNP | AMERICAN TRANSPORT | | | SCAC4 |
| 39 | ARNQ | ARNOLD TRANSFER & STORAGE INC | | | SCAC3 |
| 40 | ARNR | ARNESON, MARK TRUCKING | | | SCAC4 |
| 41 | ARNT | AMERICAN TRANSPORTATION | | | SCAC3 |
| 42 | ARNT | AMERICAN TRANSPORTATION | | | SCAC4 |
| 43 | ARNU | ARAN INTERNATIONAL SDN BHD | | | SCAC4 |
| 44 | ARNV | ARNESON TRUCKING | | | SCAC3 |
| 45 | ARNV | ARNOLD OIL INC | | | SCAC4 |
