| 1 | AOS | Servicios Aerecs Del Sol, S.A. de C.V. | Callsign: Aerosol, | MEX | AVCODES |
| 2 | AOS | Ansett Airlines of South Australia | Callsign: Alsa, | AUS | AVCODES |
| 3 | AOS | Arosflyg KB | Callsign: Aros, | S | AVCODES |
| 4 | AOS | Aeros Limited t/a Aeros Flight Training | Callsign: Aeros, | GB | AVCODES |
| 5 | AOS | Servicios Aerecs Del Sol, S.A. de C.V. | | | ICAO1 |
| 6 | AOSA | ANNALS OF ST ANNE DE BEAUPRE | | | SCAC4 |
| 7 | AOSC | ALL OCEAN SERVICES LLC | | | SCAC4 |
| 8 | AOSD | ALPINOS TRUCKING INC | | | SCAC4 |
| 9 | AOSF | AL'S OIL SERVICE INC | | | SCAC4 |
| 10 | AOSG | AIT OCEAN SYSTEMS INC | | | SCAC4 |
| 11 | AOSH | ANTIMILOS SHIPPING CORPORATION | | | SCAC3 |
| 12 | AOSH | ADORA SHIPPING AND TRADING CO | | | SCAC4 |
| 13 | AOSI | ALLIED OIL & SUPPLY INC | | | SCAC3 |
| 14 | AOSJ | ALLIANCE OPERATING SERVICES | | | SCAC4 |
| 15 | AOSL | ACE OF SPADES LIMOUSINE CO INC | | | SCAC3 |
| 16 | AOSL | ALS OIL SERVICE LLC | | | SCAC4 |
| 17 | AOSM | AUTO SPECIALTIES MANUFACTURING CO | | | SCAC3 |
| 18 | AOSN | ALLERION OILFIELD SERVICES INC | | | SCAC4 |
| 19 | AOSO | AMERIMOVE OF SOUTH CAROLINA LLC | | | SCAC4 |
| 20 | AOSP | ALPHA OMEGA SPECIALTIES TOURS | | | SCAC3 |
| 21 | AOSQ | AROSITA SHIPPING CO., INC. | | | SCAC3 |
| 22 | AOSR | ARENTZ OIL SERVICE INC | | | SCAC4 |
| 23 | AOSS | A-ONE (A-1) SCALE SERVICE INC | | | SCAC3 |
| 24 | AOSS | AERO SPECIALTY SERVICES | | | SCAC4 |
| 25 | AOST | ACROSS TOWN MOVERS | | | SCAC3 |
| 26 | AOST | ALAMO SIGHTSEEING TOURS | | | SCAC4 |
| 27 | AOSU | ALPHA OMEGA CONTAINER LINE PTE LTD | | SGP | BIC |
| 28 | AOSW | AGDER OCEAN SHIPPING AS | | | SCAC4 |
| 29 | AOSX | AGE OF STEAM LTD | | | SCAC4 |
| 30 | AOSY | ALLEN OIL CO OF SYLACAUGA INC | | | SCAC4 |
| 31 | AOSZ | A.O. SMITH INDUSTRIES | | | PWRC |
