| 1 | JAR | Airlink Luftverkehrsgesellschaft mbH | Callsign: Airlink, | A | AVCODES |
| 2 | JAR | Airlink | | | ICAO1 |
| 3 | JARC | JAR-CRIS ENTERPRISES INC | | | SCAC4 |
| 4 | JARJ | JARJA FREIGHT INC | | | SCAC4 |
| 5 | JARO | JAR TRUCKING INC | | | SCAC4 |
| 6 | JAROSZ | Tanie Linie Autobusowe, Transport-Spedycja-Usługi, Transport-Usługi Jerzy Jaroszek | City: Knurów | PL | TRAFFIC |
| 7 | JARU | SOCIETE INDUSTRIELLE DE SUCRERIE | | | SCAC4 |
| 8 | JARV | JARVIS TRANS INC | | | SCAC4 |
| 9 | JARX | John A. Roebling's Sons Corp., subsidiary of the Colorado Fuel and Iron Corp. | added 4/1953; 7/1954-10/1957; eliminated 7/1958 | | NAKINA |
| 10 | JARX | John A. Roebling's Sons Co. | 7/1935-1/1952; eliminated 4/1953 | | NAKINA |
| 11 | JARX | John A. Roebling's Sons Co. | 4/38-1/52 | | NRHS |
| 12 | JARX | John A. Roebling's Sons Corp., subsidiary of the Colorado Fuel and Iron Corp. | 10/57; eliminated 7/58 | | NRHS |
| 13 | JARX | JOHN A. ROEBLING'S SON CO., COLORADO FUEL & IRON CORP. | | | PWRC |
