| 1 | APP | Aerolíneas Islas de Las Perlas | IATA: WL, Callsign: Aeroperlas, IATA Prefix: 054, Ceased operations on 29 February 2012. TACA Regional Airline | PA | AVCODES |
| 2 | APP | Alpavia d.o.o. | Callsign: Alpavia, | SK | AVCODES |
| 3 | APP | Aerolineas Pacifico Atlantico, S.A. (Apair) | | | ICAO1 |
| 4 | APPA | APPERSON, ANDY & SONS | | | SCAC3 |
| 5 | APPB | APS TRANSPORTATION | | | SCAC4 |
| 6 | APPC | APPLIANCE STORE INC, THE | | | SCAC3 |
| 7 | APPC | APPALACHIAN TRANSPORT INC | | | SCAC4 |
| 8 | APPD | APPLIED TECHNOLOGY TRANSPORTATION | | | SCAC3 |
| 9 | APPE | APPLE EXPRESS | | | SCAC3 |
| 10 | APPF | APPA FINE FOODS INC | | | SCAC4 |
| 11 | APPG | APPLEGATE TRUCKING | | | SCAC3 |
| 12 | APPH | APPALACHIAN ENTERPRISES INC | | | SCAC4 |
| 13 | APPI | APPLIANCE CONNECTION CORP, THE | | | SCAC3 |
| 14 | APPI | APPELQUIST TRUCKING INC | | | SCAC4 |
| 15 | APPJ | ACE PAPER PRODUCTS COMPANY | | | SCAC3 |
| 16 | APPK | APPLE TRUCKING | | | SCAC3 |
| 17 | APPK | ANDERSON PAPER & PACKAGING CO INC | | | SCAC4 |
| 18 | APPL | APPLE LINES, INC | | | SCAC3 |
| 19 | APPL | APPEL OIL COMPANY | | | SCAC4 |
| 20 | APPM | APPEL TRUCKING | | | SCAC3 |
| 21 | APPN | AMERICAS TRANSPORT INC | | | SCAC3 |
| 22 | APPN | APPETITO PROVISION COMPANY INC | | | SCAC4 |
| 23 | APPP | AP TRANSPORT | | | SCAC4 |
| 24 | APPQ | APPLING WAREHOUSE CO | | | SCAC3 |
| 25 | APPQ | AKIN & PORTER PRODUCE INC | | | SCAC4 |
| 26 | APPR | AVAILABLE SHIPPERS INC | | | SCAC3 |
| 27 | APPR | AVAILABLE SHIPPERS INC | | | SCAC4 |
| 28 | APPS | APPS ENTERPRISES | | | SCAC3 |
| 29 | APPT | APPLE TRANSPORTATION COMPANY | | | SCAC3 |
| 30 | APPT | APPLE TRANSPORTATION COMPANY | | | SCAC4 |
| 31 | APPV | APPLE CARRIER | | | SCAC3 |
| 32 | APPV | ALLIANCE PIPELINE LIMITED PARTNERSH | | | SCAC4 |
| 33 | APPW | AMERICAN PACIFIC POWER APPARATUS IN | | | SCAC3 |
| 34 | APPW | APPLEWOOD ORCHARDS INC | | | SCAC4 |
| 35 | APPX | Appalachan Railcar Services, Inc. | added 10/2004; 7/2005 | | NAKINA |
| 36 | APPX | Merchants Despatch Transportation Corp. | 1/1950-10/1966; eliminated 7/1967 | | NAKINA |
| 37 | APPX | Merchants Despatch Transportation Corp. | 1/52-10/66; eliminated 7/67 | | NRHS |
| 38 | APPX | *APOLLO AIR FREIGHT CORP [MERCHANTS DESPATCH TRANSPORTATION CORP.] | | | PWRC |
| 39 | APPX | +APPALACHIAN RAILCAR SERVICES, INC | | | PWRC |
| 40 | APPX | APPALACHIAN RAILCAR SERVICES INC | | | SCAC4 |
| 41 | APPX | Appalachan Railcar Services, Inc. | | USA | TRAFFIC |
| 42 | APPY | APPLEYARDS MOTOR TRANSPORTATION COM | | | SCAC3 |
| 43 | APPY | A PLUS ENTERPRISES INC | | | SCAC4 |
