| 1 | OKC | CZ Airlines, J.S.C. | | CZ | AVCODES |
| 2 | OKC | Private Jets, Inc. | Callsign: Thunder Wings, | USA | AVCODES |
| 3 | OKCC | OK'S CASCADE CO | | | SCAC3 |
| 4 | OKCC | OMEGA TRUCKLINES INC | | | SCAC4 |
| 5 | OKCE | Okarche Central Ry., Inc. | added 10/1982; eliminated 1/1983 | | NAKINA |
| 6 | OKCE | Okarche Central Ry., Inc. | added 10/82; eliminated 1/83 | | NRHS |
| 7 | OKCE | OKARCHE CENTRAL RAILWAY | | | PWRC |
| 8 | OKCE | Okarche Central Railway | | | RSRV |
| 9 | OKCG | OAK CARTAGE INC | | | SCAC3 |
| 10 | OKCR | OKLAHOMA CITY RELOAD | | | SCAC4 |
| 11 | OKCT | OKARCHE CENTRAL RAILWAY | | | PWRC |
| 12 | OKCU | CAHAYA SAMUDERA SHIPPING PTE LTD | | | SCAC4 |
| 13 | OKCX | Lone Star Industries, Inc. | added 7/1983; 1/1994-7/2000; eliminated 1/2001; added 7/2001; 7/2005 | | NAKINA |
| 14 | OKCX | Louisiana Cement Co., Inc. | added 10/1981; eliminated 7/1983 | | NAKINA |
| 15 | OKCX | OKC Corp. | added 4/1980; eliminated 10/1981 | | NAKINA |
| 16 | OKCX | OKC Corp. | added 4/80; eliminated 10/81 | | NRHS |
| 17 | OKCX | Louisiana Cement Co., Inc. | added 10/81 | | NRHS |
| 18 | OKCX | Lone Star Industries, Inc. | 1/94-7/2000; eliminated 1/2001; added 7/2001 | | NRHS |
| 19 | OKCX | LONE STAR INDUSTRIES, INC. [LOUISIANA CEMENT CO.; OKC CORP.] | | | PWRC |
| 20 | OKCX | Lone Star Industries | | | RSRV |
| 21 | OKCX | LONE STAR INDUSTRIES, INC. | | | SCAC4 |
