| 1 | ASZ | Astrakhan Airlines | IATA: OB, Callsign: Air Astrakhan, IATA Prefix: 562, Designator OB recalled by IATA | RUS | AVCODES |
| 2 | ASZ | Air Sardinia S.p.A. | IATA: UF, | I | AVCODES |
| 3 | ASZ | Air Sardinia S.p.A. | IATA: VV, | I | AVCODES |
| 4 | ASZ | Ascension Air Management, Inc. | Callsign: Ascension, | USA | AVCODES |
| 5 | ASZ | Astrakhan Airlines | IATA: OB | | ICAO1 |
| 6 | ASZC | ALPHA SUEZMAX CORPORATION | | | SCAC4 |
| 7 | ASZD | ART STIMULI LTD | | | SCAC4 |
| 8 | ASZF | ALVAREZ SANCHEZ, FELIPE | | | SCAC4 |
| 9 | ASZG | ADELMAN SAND & GRAVEL INC | | | SCAC4 |
| 10 | ASZI | ALL STATE LOG INC | | | SCAC4 |
| 11 | ASZL | ASIA SHIPPING INTERNATIONAL TRANSPO | | | SCAC4 |
| 12 | ASZM | ASL | | | SCAC4 |
| 13 | ASZN | AMERICAN STAR CARRIER INC | | | SCAC4 |
| 14 | ASZP | ASSURE SHIPPING | | | SCAC4 |
| 15 | ASZQ | A-SPORTS CARRIER LLC | | | SCAC4 |
| 16 | ASZS | ARMADORES STFANOURIOS S.A. | | | SCAC3 |
| 17 | ASZT | ATLAS SPECIALIZED TRANSPORT INC | | | SCAC3 |
| 18 | ASZT | ATLAS SPECIALIZED TRANSPORT INC | | | SCAC4 |
| 19 | ASZW | ASMARA SERVICES S DE RL | | | SCAC4 |
| 20 | ASZY | ALL SEASONS ENERGY LLC | | | SCAC4 |
