| 1 | APO | Aeropro | Callsign: Aeropro, | CDN | AVCODES |
| 2 | APO | Air Posh d.o.o. | Callsign: Air Posh, | SR | AVCODES |
| 3 | APO | Aeropro | | | ICAO1 |
| 4 | APOA | ALL POINTS TRANSPORT | | | SCAC4 |
| 5 | APOB | APOLLO TRANSPORTATION SPECIALIST IN | | | SCAC4 |
| 6 | APOF | APOLLO FORWARDERS INC | | | SCAC3 |
| 7 | APOG | APPOLOSSA TRUCKING INC | | | SCAC3 |
| 8 | APOH | APOLLO ATHLETICS | | | SCAC4 |
| 9 | APOM | APOLLO MOVING & STORAGE INC | | | SCAC3 |
| 10 | APOM | ASHPOINT CATTLE CO | | | SCAC4 |
| 11 | APON | ALL POINTS EXPRESS INC | | | SCAC3 |
| 12 | APOO | APOLLO TRANSPORTS INC | | | SCAC3 |
| 13 | APOO | APOLLO SKY | | | SCAC4 |
| 14 | APOP | ARPIN, PAUL OF PENSACOLA | | | SCAC3 |
| 15 | APOQ | APOLLO CARTAGE INC | | | SCAC3 |
| 16 | APOQ | ALPICO INTERNATIONAL INC | | | SCAC4 |
| 17 | APOR | AMERICAN TRANSPORT LEASING INC | | | SCAC3 |
| 18 | APOR | APOLO REFRIGERADOS SA DE CV | | | SCAC4 |
| 19 | APOS | AIRPORT LIMOUSINE SERVICE INC | | | SCAC3 |
| 20 | APOV | APOLLO VAN LINES INC | | | SCAC3 |
| 21 | APOV | APOLLO VAN LINES INC | | | SCAC4 |
| 22 | APOX | Alabama Power Co. | added 4/1998; eliminated 7/1999; 7/2000-7/2005 | | NAKINA |
| 23 | APOX | Apco Oil Corp. | added 7/1961; 7/1965-4/1970; eliminated 1/1974 | | NAKINA |
| 24 | APOX | Anderson-Pritchard Oil Corp. | added 10/1953; 7/1954-4/1961; eliminated 7/1961 | | NAKINA |
| 25 | APOX | Kanotex Refining Co. | eliminated 10/1953 | | NAKINA |
| 26 | APOX | Bradford Oil Refining Co. | 7/1923-7/1936; 7/1937 (not listed) | | NAKINA |
| 27 | APOX | Kanotex Refining Co. | eliminated 10/53 | | NRHS |
| 28 | APOX | Anderson-Pritchard Oil Corp. | added 10/53; 10/57-4/61 | | NRHS |
| 29 | APOX | Apco Oil Corp. | 7/65-4/70; eliminated 1/74 | | NRHS |
| 30 | APOX | Alabama Power Co. | added 4/98; eliminated 7/99; 7/2000 | | NRHS |
| 31 | APOX | *BRADFORD OIL REFINING CO. | | | PWRC |
| 32 | APOX | *APCO OIL CORP. {KANOTEX REFINING CO.; ANDERSON-PRITCHARD OIL CORP.] (ELIMINATED 1/1974) | | | PWRC |
| 33 | APOX | +ALABAMA POWER COMPANY | | | PWRC |
| 34 | APOX | Alabama Power | | | RSRV |
| 35 | APOX | APCO OIL CORP | | | SCAC3 |
| 36 | APOX | ALABAMA POWER COMPANY | | | SCAC4 |
| 37 | APOY | APACHE OIL COMPANY | | | SCAC4 |
| 38 | APOZ | ALABAMA POWER COMPANY | | | PWRC |
