| 1 | Q | Inch | TRAFFIC | ||
| 2 | Q&LS | Quebec & Lake St. John Ry. (Canadian National Rys.) | 8/1920-7/1923 | NAKINA | |
| 3 | Q&LS | CANADIAN NATIONAL RWYS. [QUEBEC & LAKE ST. JOHN RWY.] | PWRC | ||
| 4 | QA&P | Quanah, Acme & Pacific Ry. Co. | 7/1923 | NAKINA | |
| 5 | QA&P | QUANAH, ACME & PACIFIC RWY. CO. | PWRC | ||
| 6 | QAC | Qatar Air Cargo | ICAO1 | ||
| 7 | QACG | QUINCY AIR CARGO INC | SCAC3 | ||
| 8 | QACL | QUEST AIRCRAFT COMPANY LLC | SCAC4 | ||
| 9 | QADQ | QUAD CITY LEASING COMPANY INC | SCAC3 | ||
| 10 | QADT | QUAD TRANSPORTATION SERVICES LLC | SCAC4 | ||
| 11 | QAF | Qatar Amiri Flight | ICAO1 | ||
| 12 | QAFI | QUALITY AIR FORWARDING INC | SCAC4 | ||
| 13 | QAH | Quick Airways Holland | ICAO1 | ||
| 14 | QAJ | Quick Air Jet Charter | ICAO1 | ||
| 15 | QALL | QUALLS OIL CO INC | SCAC4 | ||
| 16 | QALT | QUALITY TRANSPORTATION INC | SCAC3 | ||
| 17 | QALY | QUALITY TRANSPORT INC | SCAC3 | ||
| 18 | QANA | QANTAS AIRWAYS LTD | SCAC4 | ||
| 19 | QAP | (QA&P) Quanah, Acme & Pacific Ry. Co. | 7/1930-1/1980; eliminated 7/1981 | NAKINA | |
| 20 | QAP | Quanah, Acme & Pacific Ry. Co. | 4/38-1/80; eliminated 7/81 | NRHS | |
| 21 | QAP | QUANAH, ACME & PACIFIC RWY. CO. | PWRC | ||
| 22 | QAPE | QU'APPELLE APPALOOSA RANCH | SCAC4 | ||
| 23 | QAPI | QWEST AIR PARTS INC | SCAC4 | ||
| 24 | QAQ | Qurinea Air Service | ICAO1 | ||
| 25 | QAQL | QUICK AND QUALITY LOGISTICS INC | SCAC4 | ||
| 26 | QARX | QUEEN ANNE'S RAILROAD TOURIST / DINNER TRAIN OPERATOR | PWRC | ||
| 27 | QAS | Quisqueya Airlines | ICAO1 | ||
| 28 | QASW | Q ARION SHIPPING LTD | SCAC4 | ||
| 29 | QAT | Aero Taxi | ICAO1 | ||
| 30 | QATA | QATAR AIRWAYS | SCAC4 | ||
| 31 | QATI | QAT INC | SCAC3 | ||
| 32 | QATL | QUADRA TRANSPORT LTD | SCAC3 | ||
| 33 | QATP | QUALITY TRANSPORT, INC | SCAC3 | ||
| 34 | QATP | QUALITY TRANSPORT INC | SCAC4 | ||
| 35 | QATR | QATAR SHIPPING COMPANY Q S C | SCAC4 | ||
| 36 | QATT | QUALITY AUTO TRANSPORT | SCAC3 | ||
| 37 | QATY | QUALITY HOT MIX TRUCKING INC | SCAC4 | ||
| 38 | QAUQ | QUOTE A UNQUOTE TRANSPORTATION INC | SCAC3 | ||
| 39 | QAWC | QUALITY WAREHOUSE CO INC | SCAC3 | ||
| 40 | QBAX | QUALITY BAKERS OF AMERICA COOPERATI | SCAC3 | ||
| 41 | QBCR | QB CORPORATION | SCAC3 | ||
| 42 | QBEC | QUEBEC SHIPPING CORP | SCAC3 | ||
| 43 | QBMO | QUEEN BEE MOVERS | SCAC3 | ||
| 44 | QBSA | QUALITY BATTERY SYSTEMS | SCAC4 | ||
| 45 | QBSC | QUEENSBRIDGE SHIPPING CORP MONROVIA | SCAC3 | ||
| 46 | QBT | Quincy Bay Terminal Co. | added 10/1992; 1/1994-7/2000; eliminated 10/2001; 7/2005 | NAKINA | |
| 47 | QBT | Quincy Bay Terminal Co. | added 10/92; 1/94-7/2000 | NRHS | |
| 48 | QBT | QUINCY BAY TERMINAL COMPANY | PWRC | ||
| 49 | QBT | Quincy Bay Terminal | RSRV | ||
| 50 | QBTI | QUISENBERRY TRUCKING INC | SCAC3 | ||
| 51 | QBTI | QB TRANSPORT INC | SCAC4 | ||
| 52 | QBUS | Q-Bus Nahverkehrsgesellschaft mbH | City: Ballenstedt | D | TRAFFIC |
| 53 | QBUZ | Qbuzz | NL | TRAFFIC | |
| 54 | QBXI | QUEBEC EXPRESS INC | SCAC3 | ||
| 55 | QBXU | CHS CONTAINER HANDEL GMBH | SCAC4 | ||
| 56 | QC | Canadian Pacific Ry. Co. | added 1/1997; 7/2000-7/2005 | NAKINA | |
| 57 | QC | CP Rail System (Canadian Pacific Ltd.) | added 7/1994; eliminated 1/1997 | NAKINA | |
| 58 | QC | Quebec Central Ry. (Co.) | 8/1920-10/1957; 1/1975; added 10/1979; 1/1980-1/1994; eliminated 7/1994 | NAKINA | |
| 59 | QC | Quebec Central Ry. | 4/38-10/57 | NRHS | |
| 60 | QC | Quebec Central Ry. Co. | 1/75-1/94; eliminated 7/94 | NRHS | |
| 61 | QC | CP Rail System (Canadian Pacific Ltd.) | added 7/94; eliminated 1/97 | NRHS | |
| 62 | QC | Canadian Pacific Ry. Co. | added 1/97; 7/2000 | NRHS | |
| 63 | QC | CP RAIL [QUEBEC CENTRAL RY] | PWRC | ||
| 64 | QC | Quebec Central Railway | RSRV | ||
| 65 | QC | Quebec Central Railway Company | CDN | TRAFFIC | |
| 66 | QCAF | QUEEN CITY AIR FREIGHT | SCAC3 | ||
| 67 | QCAF | QUEEN CITY AIR FREIGHT | SCAC4 | ||
| 68 | QCAI | Q CARRIERS INC | SCAC3 | ||
| 69 | QCBH | QCB SHIPPING | SCAC4 | ||
| 70 | QCC | Qwest Commuter Corporation | ICAO1 | ||
| 71 | QCCC | QUICK/CARE CORPORATION | SCAC3 | ||
| 72 | QCCC | QUICKPICK.COM LLC | SCAC4 | ||
| 73 | QCCI | QUAKER CITY CHEMICALS INC | SCAC4 | ||
| 74 | QCCR | QUAL CON CONCRETE CONTRACTORS | SCAC4 | ||
| 75 | QCCX | General Electric Rail Services Corp. | added 10/2009 | NAKINA | |
| 76 | QCCX | Equistar Chemicals, LP | added 4/1998; 7/2000-7/2005; eliminated 10/2009 | NAKINA | |
| 77 | QCCX | Quantum Chemical Corp., USI Division | eliminated 4/1998 | NAKINA | |
| 78 | QCCX | Trancisco Leasing Co. | added 10/1996; eliminated 1/1997 | NAKINA | |
| 79 | QCCX | Quantum Chemical Corp. | added 1/1997 | NAKINA | |
| 80 | QCCX | Trancisco Leasing Co. | added 10/96; eliminated 1/97 | NRHS | |
| 81 | QCCX | Quantum Chemical Corp. | added 1/97 | NRHS | |
| 82 | QCCX | Quantum Chemical Corp., USI Division | eliminated 4/98 | NRHS | |
| 83 | QCCX | Equistar Chemicals, LP | added 4/98; 7/2000 | NRHS | |
| 84 | QCCX | EQUISTAR CHEMICALS LP [QUANTUM CHEMICAL CORP.] (TRANCISCO LEASING) | PWRC | ||
| 85 | QCCX | Quantum Chemical Corporation | RSRV | ||
| 86 | QCCX | EQUISTAR CHEMICALS LP | SCAC4 | ||
| 87 | QCDS | QUALITY COURIER & DELIVERY SERVICE | SCAC3 | ||
| 88 | QCEP | QUIVAS CARGO EXPRESS | SCAC4 | ||
| 89 | QCFL | QUIK CHEK FUELS | SCAC4 | ||
| 90 | QCGU | Quest Capital Group | RSRV | ||
| 91 | QCGU | QUEST CAPITAL GROUP LLC | SCAC4 | ||
| 92 | QCHM | QUALITY CRAFT HOMES | SCAC4 | ||
| 93 | QCIC | QUALITY CARTAGE INCORPORATED | SCAC3 | ||
| 94 | QCIN | QUALITY COURIER INC | SCAC3 | ||
| 95 | QCIY | QUEEN CITY INC | SCAC4 | ||
| 96 | QCL | Air Class Lineas Aereas | IATA: QD | ICAO1 | |
| 97 | QCLH | QUAIL CREEK LIVESTOCK HAULING INC | SCAC4 | ||
| 98 | QCLI | QUALITY COACH LINES INC | SCAC3 | ||
| 99 | QCLL | QUICK COACH LINES LTD | SCAC3 | ||
| 100 | QCLL | QUICK COACH LINES LTD | SCAC4 |