| 1 | KOP | Servicios Aereos Copters Ltda. | Callsign: Copters, Ceased operations | RCH | AVCODES |
| 2 | KOP | Servicios Aereos Copters | | | ICAO1 |
| 3 | KOPA | KOPALA TRANSPORT LLC | | | SCAC4 |
| 4 | KOPB | KOPICZ, BRUCE W | | | SCAC3 |
| 5 | KOPC | KOPPERS COMPANY | | | PWRC |
| 6 | KOPE | KOPECK, EDWARD INC | | | SCAC3 |
| 7 | KOPF | KOPF HARRY HORSE TRANSPORTATION INC | | | SCAC3 |
| 8 | KOPP | KOPPERUD TRANSPORTATION | | | SCAC3 |
| 9 | KOPP | KOPPERUD TRANSPORTATION | | | SCAC4 |
| 10 | KOPQ | KOPP TRANSFER | | | SCAC3 |
| 11 | KOPR | KOOPS, RICH TRUCKING | | | SCAC3 |
| 12 | KOPT | KOPF TRUCKING INC | | | SCAC3 |
| 13 | KOPT | KOPF LEASING INCORPORATED | | | SCAC4 |
| 14 | KOPX | National Equipment Leasing Corp. | added 4/1962; 7/1965-1/1975; eliminated 4/1975; 1/1980 | | NAKINA |
| 15 | KOPX | Koppers Co., Inc. | 1/1941-1/1952 | | NAKINA |
| 16 | KOPX | Koppers Co. | 7/1937-4/1938 | | NAKINA |
| 17 | KOPX | The Koppers Co. | 7/1923-7/1935 | | NAKINA |
| 18 | KOPX | National Equipment Leasing Corp. | added 4/62; 7/65-1/75; eliminated 4/75; 1/80 | | NRHS |
| 19 | KOPX | Koppers Co., Inc. | 4/38-1/52 | | NRHS |
| 20 | KOPX | *KOPPERS CO. | | | PWRC |
| 21 | KOPX | *NATIONAL EQUIPMENT LEASING CORP. | | | PWRC |
| 22 | KOPY | KOPPYS PROPANE INC | | | SCAC4 |
