| 1 | QTX | Quantex Environmental, Inc. | Callsign: Air Quantex, | CDN | AVCODES |
| 2 | QTX | Quantex Environmental | | | ICAO1 |
| 3 | QTX | General American Transportation Corp. | 7/1937-1/1943 | | NAKINA |
| 4 | QTX | Quaker City Tank Line (General American Tank Car Corp.) | 7/1935 | | NAKINA |
| 5 | QTX | Quaker City Tank Line | 7/1930-7/1932 | | NAKINA |
| 6 | QTX | Quaker City Tank Line (General American Transportation Corp.) | Apr-38 | | NRHS |
| 7 | QTX | QUAKER CITY TANK LINE | | | PWRC |
| 8 | QTXI | QUICK TRUX INC | | | SCAC3 |
| 9 | QTXI | QUEST EXPRESS TRUCKING | | | SCAC4 |
| 10 | QTXL | QUALITY TRANSPORT LLC | | | SCAC4 |
