| 1 | NTT | Inter Tropic Airlines (S.L.) Ltd. | Callsign: Inter-Tropic, | WAL | AVCODES |
| 2 | NTT | Inter Tropic Airlines | | | ICAO1 |
| 3 | NTTA | NORTON TRANSPORT INC | | | SCAC3 |
| 4 | NTTB | NINE ZERO THREE TWO- SEVEN FIVE SIX | | | SCAC4 |
| 5 | NTTD | NATIONAL TANK TRUCK DELIVERY INC. | | | PWRC |
| 6 | NTTE | NINE TWO TWO NINE-ONE EIGHT THREE Z | | | SCAC4 |
| 7 | NTTF | NINE ONE TWO T | | | SCAC4 |
| 8 | NTTG | NORRIS, TERRY TRUCKING INC | | | SCAC3 |
| 9 | NTTH | NORTH TERRACE TRANSFER LLC | | | SCAC4 |
| 10 | NTTJ | NEUBAUER, TIM TRUCKING LLC | | | SCAC4 |
| 11 | NTTK | NATES TRUCKING INC | | | SCAC3 |
| 12 | NTTK | NIGHT TRAIN TRUCKING INC | | | SCAC4 |
| 13 | NTTN | N T TRANSPORT INC | | | SCAC4 |
| 14 | NTTQ | NINE ONE FOUR THREE-EIGHT SIX SIX T | | | SCAC4 |
| 15 | NTTR | NIGHT TRAIN INC | | | SCAC3 |
| 16 | NTTR | NINE ZERO TWO NINE-THREE ONE FIVE O | | | SCAC4 |
| 17 | NTTS | NATIONAL TELE-TRUCK SYSTEMS INC | | | SCAC4 |
| 18 | NTTU | NANTONG TANK CONTAINER CO, LTD | | PRC | BIC |
| 19 | NTTU | NANTONG TANK CONTAINER CO LTD | | | SCAC4 |
| 20 | NTTV | NINE TWO TWO ZERO-ONE SIX SIX FOUR | | | SCAC4 |
| 21 | NTTW | NINE TWO TWO ZERO-FIVE TWO FOUR FOU | | | SCAC4 |
| 22 | NTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 23 | NTTX | Trailer Train Co. | added 10/1986; eliminated 1/1992 | | NAKINA |
| 24 | NTTX | Trailer Train Co./TTX Co. (skeletonized, 5-unit, articulated, single-stack COFC car) | added 10/1986; 10/1991-7/2000 | | NAKINA |
| 25 | NTTX | Trailer Train Co. | added 10/86; eliminated 1/92 | | NRHS |
| 26 | NTTX | TTX Co. | added 1/92 | | NRHS |
| 27 | NTTX | TTX Co. (skeletonized, 5-unit, articulated, single-stack COFC car) | 1/94-7/2000 | | NRHS |
| 28 | NTTX | TTX COMPANY | | | PWRC |
| 29 | NTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 30 | NTTX | TTX COMPANY | | | SCAC4 |
| 31 | NTTY | NISTLER, TONY TRUCKING | | | SCAC4 |
