| Abbreviation | Definition |
|---|---|
| JMA | Jackson Municipal Airport |
| JMAA | Jackson Municipal Airport Authority |
| JNC | Jet Navigation Chart |
| JNPT | Jawaharlal Nehru Port |
| JRFS | John Ryan Freight Services |
| JRTC | Jacksonville Regional Transportation Center |
| JS | Jump Starting |
| JSV | Job Site Vehicle |
| JTA | Jacksonville Transportation Authority |
| JTA | Jobs and Transportation Act |
| JTI | Transportation Inc |
| JTIC | Joint Transportation Intelligence Center |
| JTMC | Joint Transportation Management Center |
| JTMP | Jerusalem Transportation Master Plan |
| JTS | Jacques Thibaud String Trio |
| JTS | Johanson Transportation Service |
| JTTE | Journal of Traffic and Transportation Engineering |
| J-T-W | Journey To Work |
| JUMVEA | Japan Used Motor Vehicle Exporters Association |
| JUP | Joint University Program for Air Transportation |