| 1 | AZ | Alitalia-Compagnia Aerea Italiana S.p.A. | ICAO: AZA, Callsign: Alitalia, IATA Prefix: 055, Name changed to Alitalia Societa Aerea Italiana S.p.A. w.e.f. 13 January 2009 assets transferred from old airline Alitalia - Linee Aeree Italiane | I | AVCODES |
| 2 | AZ | Alitalia Societa Aerea Italiana S.p.A. | ICAO: AZA, Callsign: Alitalia, IATA Prefix: 055, Name changed from Alitalia-Compagnia Aerea Italiana S.p.A. w.e.f. 13 January 2009 assets transferred from old airline Alitalia - Linee Aeree Italiane | I | AVCODES |
| 3 | AZ | Italia Transporto Aereo S.p.A. d/b/a ITA S.p.A | ICAO: ITY, Callsign: Itarrow, IATA Prefix: 055, | I | AVCODES |
| 4 | AZ | ANACMAIN RAILROAD | | | PWRC |
| 5 | AZ | Azerbaycan Dövlet Demir Yolu | Real: ADDY | AZ | TRAFFIC |
| 6 | AZ | Railways of Azerbaidjan | | AZ | VKM |
| 7 | AZA | Alitalia-Compagnia Aerea Italiana S.p.A. | IATA: AZ, Callsign: Alitalia, IATA Prefix: 055, Name changed to Alitalia Societa Aerea Italiana S.p.A. w.e.f. 13 January 2009 assets transferred from old airline Alitalia - Linee Aeree Italiane | I | AVCODES |
| 8 | AZA | Alitalia Societa Aerea Italiana S.p.A. | IATA: AZ, Callsign: Alitalia, IATA Prefix: 055, Name changed from Alitalia-Compagnia Aerea Italiana S.p.A. w.e.f. 13 January 2009 assets transferred from old airline Alitalia - Linee Aeree Italiane | I | AVCODES |
| 9 | AZA | Alitalia | IATA: AZ | | ICAO1 |
| 10 | AZAC | AZAZ CORP | | | SCAC4 |
| 11 | AZAFT | Asociación Zaragozana de Amigos del Ferrocarril y Tranvías | | E | TRAFFIC |
| 12 | AZAL | Azerbaijan Airlines | Real: AHY | AZ | TRAFFIC |
| 13 | AZAO | A-Z AUTO | | | SCAC4 |
| 14 | AZAP | AZAP MOTORS INC | | | SCAC4 |
| 15 | AZAR | AZUARA AZUARA, AMADO F | | | SCAC4 |
| 16 | AZB | Azamat | Callsign: Tumara, | KZ | AVCODES |
| 17 | AZB | Zambia Airways (2014) Limited | IATA: ZN, Callsign: Air Zambia, IATA Prefix: 138, | Z | AVCODES |
| 18 | AZB | Azamat | | | ICAO1 |
| 19 | AZBAU | Achatz GmbH Bauunteinehmung | | DE | VKM |
| 20 | AZBC | A TO Z BUS & CHARTER | | | SCAC3 |
| 21 | AZBF | ARIZONA BEST FREIGHT | | | SCAC3 |
| 22 | AZBF | AZULEMAR FISHING | | | SCAC4 |
| 23 | AZBG | ARIZONA BEST FREIGHT LLC | | | SCAC4 |
| 24 | AZBI | A TO Z TRUCK BROKERS INC | | | SCAC4 |
| 25 | AZBS | AZEVEDO, BEN & SO TRUCKING | | | SCAC3 |
| 26 | AZBT | AIZ USA LLC | | | SCAC4 |
| 27 | AZCA | ARIZONA CATTLE | | | SCAC3 |
| 28 | AZCC | AZTEC COPPER INC | | | SCAC4 |
| 29 | AZCD | ARIZONA CONTAINER DISTRIBUTION INC | | | SCAC3 |
| 30 | AZCG | ARIZONA CARGO PICK-UP & DELVIERY IN | | | SCAC3 |
| 31 | AZCL | ARIZONA CENTRAL LINES | | | SCAC3 |
| 32 | AZCL | AZTEC LOGISTICS LLC | | | SCAC4 |
| 33 | AZCN | AZTEC TRANSPORTATION LLC | | | SCAC4 |
| 34 | AZCO | AZCO HENNES INC | | | SCAC3 |
| 35 | AZCQ | AZ-CAR-GO | | | SCAC3 |
| 36 | AZCR | Arizona Central R.R., Inc. | added 7/1989; 1/1994-7/2005; eliminated 1/2008 | | NAKINA |
| 37 | AZCR | Arizona Central R.R., Inc. | added 7/89; 1/94-7/2000 | | NRHS |
| 38 | AZCR | ARIZONA CENTRAL RAILROAD INC. | | | PWRC |
| 39 | AZCR | Arizona Central Railroad | | | RSRV |
| 40 | AZCR | ARIZONA CENTRAL RAILROAD INC | | | SCAC3 |
| 41 | AZCR | Arizona Central Railroad / Verde Canyon Railroad | The Arizona Central Railroad (reporting mark AZCR) is an Arizona shortline railroad that operates from a connection with the BNSF Railway at Drake. The AZCR runs 37.8 miles (60.8 km) from Drake to Clarkdale, Arizona. An excursion train also runs on the line through Verde Canyon and is operated by the same owners under the Verde Canyon Railroad. | USA | TRAFFIC |
| 42 | AZCS | ANZELDE CARTAGE SERVICE | | | SCAC3 |
| 43 | AZCT | ARIZONA COACH TOURS INC | | | SCAC3 |
| 44 | AZCX | Azcon Corp. | added 10/1996; eliminated 7/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 45 | AZCX | American Zinc & Chemical Co. | 8/1920-1/1943; 1/1945 (not listed) | | NAKINA |
| 46 | AZCX | American Zinc & Chemical Co. | Apr-38 | | NRHS |
| 47 | AZCX | Azcon Corp. | added 10/96; eliminated 7/98; 7/2000 | | NRHS |
| 48 | AZCX | *AMERICAN ZINC & CHEMICAL CO.. | | | PWRC |
| 49 | AZCX | +AZCON CORPORATION | | | PWRC |
| 50 | AZCX | Azcon Corporation | | | RSRV |
| 51 | AZCX | AZCON CORPORATION | | | SCAC4 |
| 52 | AZCY | ANZIO SHIPPING COMPANY LIMITED | | | SCAC4 |
| 53 | AZD | Aral | Callsign: Aral Air, | KZ | AVCODES |
| 54 | AZD | Zimex Aviation Austria AG | Callsign: Mailman, | A | AVCODES |
| 55 | AZD | AZD Praha s.r.o | | CS | TRAFFIC |
| 56 | AZDE | A-Z DELIVERY INC | | | SCAC4 |
| 57 | AZDO | ANZALDO, ALEX FREIGHT SERVICE | | | SCAC3 |
| 58 | AZDP | AZ DISPATCH INC | | | SCAC3 |
| 59 | AZDS | A II Z DELIVERY SERVICE | | | SCAC3 |
| 60 | AZE | Cosmos Air Luftfahrtunternehmen GmbH | IATA: ZE, Callsign: Arcus Air, Name changed to Arcus Air Logistic GmbH | D | AVCODES |
| 61 | AZE | Arcus Air Logistic GmbH | IATA: ZE, Callsign: Arcus Air, Name changed from Cosmos Air Luftfahrtunternehmen GmbH | D | AVCODES |
| 62 | AZE | Arcus Air Logistic GmbH | Callsign: Arcus Air, Name changed from Cosmos Air Luftfahrtunternehmen GmbH | D | AVCODES |
| 63 | AZE | Arcus-Air Logistic | IATA: ZE | | ICAO1 |
| 64 | AZEC | AZTECA ENTERPRISES INC | | | SCAC3 |
| 65 | AZEC | AZTECA ENTERPRISES INC | | | SCAC4 |
| 66 | AZEN | ARIZONA ENVIRONMENTAL CONTAINER COR | | | SCAC4 |
| 67 | AZEP | AMZAC ENTERPRISES, INC | | | SCAC3 |
| 68 | AZEP | AMZAC ENTERPRISES INC | | | SCAC4 |
| 69 | AZER | Arizona Eastern Ry. Co. | added 1/1989; 1/1994; eliminated 7/1994; 7/2000-7/2005 | | NAKINA |
| 70 | AZER | Arizona Eastern Ry. Co. | added 1/89; 1/94; eliminated 7/94; 7/2000 | | NRHS |
| 71 | AZER | ARIZONA EASTERN RAILWAY CO. | | | PWRC |
| 72 | AZER | Arizona Eastern Railway | | | RSRV |
| 73 | AZER | Arizona Eastern Railway | | | RSRV |
| 74 | AZER | ARIZONA EASTERN RAILWAY COMPANY | | | SCAC3 |
| 75 | AZER | Arizona Eastern Railway Company | | USA | TRAFFIC |
| 76 | AZES | ALVAREZ EXPRESS | | | SCAC4 |
| 77 | AZEX | Arizona Electric Power Cooperative, Inc. | added 4/1978; 1/1980-7/2005 | | NAKINA |
| 78 | AZEX | Arizona Electric Power Cooperative, Inc. | added 4/78; 1/80-7/2000 | | NRHS |
| 79 | AZEX | ARIZONA ELECTRIC POWER COOP.,INC. | | | PWRC |
| 80 | AZEX | Arizona Electric Power Cooperative | | | RSRV |
| 81 | AZEX | ARIZONA ELECTRIC POWER COOP.,INC. | | | SCAC4 |
| 82 | AZF | Air Zermatt AG | Callsign: Air Zermatt, | CH | AVCODES |
| 83 | AZF | Air Zermatt AG | | | ICAO1 |
| 84 | AZFD | AZTEC FRAMES LTD | | | SCAC4 |
| 85 | AZFG | AZTEC FORWARDING INC | | | SCAC3 |
| 86 | AZFI | AZALEA FLEET INC | | | SCAC3 |
| 87 | AZFR | AUDZ TRANSFER | | | SCAC4 |
| 88 | AZFS | ARIZONA FREIGHT SYSTEMS INC | | | SCAC3 |
| 89 | AZFS | A2Z FREIGHT SERVICES LLC | | | SCAC4 |
| 90 | AZG | Sakaviaservice | Callsign: Sakservice, Ceased operations | GE | AVCODES |
| 91 | AZG | Silk Way West Airlines | IATA: 7L, Callsign: Silk West, IATA Prefix: 501, Subsidary of Silk Way Airlines ZP*/AZQ | AZ | AVCODES |
| 92 | AZG | Sakaviaservice | | | ICAO1 |
| 93 | AZGD | AMAZING DISCOVERIES | | | SCAC4 |
| 94 | AZH | Sky Wind | Callsign: Sky Wind, | AZ | AVCODES |
| 95 | AZH | SW Helicopter Services | Callsign: Heliaze, | AZ | AVCODES |
| 96 | AZHE | ARIZONA HIGHWAY EXPRESS | | | SCAC3 |
| 97 | AZI | Azzzurra Air S.p.A. | IATA: ZS, Callsign: Azzurra Air, IATA Prefix: 864, Ceased operations in March 2004. Designator ZS* reinstated by IATA | I | AVCODES |
| 98 | AZI | Air Zimbabwe Corporation | IATA: WX, Callsign: Air Zimbabwe, ICAO designator changed to AZW | ZW | AVCODES |
| 99 | AZI | Astra Airlines | IATA: A2, Callsign: Greek Star, Ceased operations on 14 November 2019. | GR | AVCODES |
| 100 | AZI | Azzurra Air | IATA: ZS | | ICAO1 |
