| 1 | QUA | Quassar de Mexico, S.A. de C.V. | Callsign: Quassar, | MEX | AVCODES |
| 2 | QUAB | QUABOAG TRANSFER INC | | | SCAC3 |
| 3 | QUAC | QUAKER CITY FORWARDERS, INC | | | SCAC3 |
| 4 | QUAD | QUAD CITIES SPOTTING SERVICE | | | SCAC3 |
| 5 | QUADR | QUADRUM BVBA | | BE | VKM |
| 6 | QUAE | QUASAR EXPRESS | | | SCAC3 |
| 7 | QUAF | QUICK AIR FREIGHT INC | | | SCAC3 |
| 8 | QUAF | QUICK AIR FREIGHT INC | | | SCAC4 |
| 9 | QUAI | QUALITY MOVING & STORAGE INC | | | SCAC3 |
| 10 | QUAK | QUAKER TRANSPORT, INC | | | SCAC3 |
| 11 | QUAK | QUAKER TRANSPORT INC | | | SCAC4 |
| 12 | QUAM | QUALITY TEAM 1 | | | SCAC4 |
| 13 | QUAN | QUANDT TANK LINES | | | SCAC3 |
| 14 | QUAN | QUANTUM TRANSPORTATION LTD | | | SCAC4 |
| 15 | QUAO | QUALITY CONTAINER TRANSPORT INC | | | SCAC4 |
| 16 | QUAR | QUARRY TRUCK CO INC | | | SCAC3 |
| 17 | QUAS | QUAST TRANSFER, INC | | | SCAC3 |
| 18 | QUAS | QUAY TRANSPORT SERVICES INC | | | SCAC4 |
| 19 | QUASE | Quadrante Servizi S.r.l. | | I | TRAFFIC |
| 20 | QUAT | QUAKER TRANSIT CO INC | | | SCAC3 |
| 21 | QUAX | Redstreak, LLC | 7/2005 (not listed); added 1/2007 | | NAKINA |
| 22 | QUAX | Quality Rail Services, LLC | added 1/2000; 7/2000; eliminated 4/2001 | | NAKINA |
| 23 | QUAX | Quality Rail Services, LLC | added 1/2000; 7/2000; eliminated 4/2001 | | NRHS |
| 24 | QUAX | *QUALITY RAIL SERVICES, LLC | | | PWRC |
| 25 | QUAX | +REDSTREAK, LLC | | | PWRC |
| 26 | QUAX | Quality Rail Services | | | RSRV |
| 27 | QUAX | REDSTREAK LLC | | | SCAC4 |
| 28 | QUAY | QUALITY COURIER&EXPRESS SERVICE | | | SCAC3 |
| 29 | QUAY | QUALITY COURIER & EXPRESS SERVICE | | | SCAC4 |
