| 9901 | PTSQ | PIHL TRANSFER & STORAGE | | | SCAC3 |
| 9902 | PTSQ | PTS LOGISTICS INC | | | SCAC4 |
| 9903 | PTSR | PRIORITY TRANSPORTATION SERVICES IN | | | SCAC3 |
| 9904 | PTSS | POTTSVILLE STORAGE & TRANSFER CO | | | SCAC3 |
| 9905 | PTSS | PRECISION TRANSPORT SERVICES INC | | | SCAC4 |
| 9906 | PTST | POTTS TRUCKING COMPANY | | | SCAC3 |
| 9907 | PTSU | PENTALVER TRANSPORT LIMITED | | GB | BIC |
| 9908 | PTSU | Pacer International | | | RSRV |
| 9909 | PTSU | PACER INTERNATIONAL INC | | | SCAC4 |
| 9910 | PTSV | POTTSVILLE MOVING AND STORAGE CO IN | | | SCAC3 |
| 9911 | PTSW | POST-TRON SYSTEMS CORPORATION | | | SCAC3 |
| 9912 | PTSX | Petrosol International, Inc. | added 10/1985; 1/1994-7/2005 | | NAKINA |
| 9913 | PTSX | Proleride Transport System, Inc. | added 7/1964; 7/1965-4/1970; eliminated 10/1972 | | NAKINA |
| 9914 | PTSX | Keith Railway Equipment Co. | 1/1952; eliminated 10/1953 | | NAKINA |
| 9915 | PTSX | Painter Transportation Service | 4/1947-1/1950 | | NAKINA |
| 9916 | PTSX | Keith Railway Equipment Co. | 1/52; eliminated 10/53 | | NRHS |
| 9917 | PTSX | Proleride Transport System, Inc. | added 7/64; 7/65-4/70; eliminated 10/72 | | NRHS |
| 9918 | PTSX | Petrosol International, Inc. | 1/94-7/2000 | | NRHS |
| 9919 | PTSX | *KEITH RAILWAY EQUIPMENT CO. [PAINTER TRANSPORTATION SERVICE] | | | PWRC |
| 9920 | PTSX | *PROLERIDE TRANSPORT SYSTEM, INC. | | | PWRC |
| 9921 | PTSX | +PETROSOL INTERNATIONAL, INC. | | | PWRC |
| 9922 | PTSX | Petrosol International | | | RSRV |
| 9923 | PTSX | PROLERIDE TRANSPORT SYSTEM INC | | | SCAC3 |
| 9924 | PTSX | PETROSOL INTERNATIONAL INC | | | SCAC4 |
| 9925 | PTSY | PRICE TRANSPORTATION SYSTEM INC, TH | | | SCAC3 |
| 9926 | PTSY | POWERTRAIN SYSTEMS | | | SCAC4 |
| 9927 | PTT | Promotora Industra Totolapa, S.A. de C.V. | Callsign: Totolapa, | MEX | AVCODES |
| 9928 | PTT | Promotora Industria Totolapa | | | ICAO1 |
| 9929 | PTT | Post | | CH | TRAFFIC |
| 9930 | PTTA | PARAMOUNT TRUCK SALES | | | SCAC4 |
| 9931 | PTTB | PTL TIRE SERVICE INC | | | SCAC3 |
| 9932 | PTTB | PATTON LUMBER CO | | | SCAC4 |
| 9933 | PTTC | PATERSON TALLOW CO | | | SCAC3 |
| 9934 | PTTC | PINE TREE TRUCKING | | | SCAC4 |
| 9935 | PTTD | PATTI DELIVERY INC | | | SCAC3 |
| 9936 | PTTD | POTTER INC | | | SCAC4 |
| 9937 | PTTE | POTTER, TROY INC | | | SCAC3 |
| 9938 | PTTE | PATTERSON, GRANT | | | SCAC4 |
| 9939 | PTTF | PETERSON TRANSFER | | | SCAC3 |
| 9940 | PTTF | POINT TRANSFER | | | SCAC4 |
| 9941 | PTTG | PONTIAC TRUCKING INC | | | SCAC3 |
| 9942 | PTTG | PARTEE TRUCKING | | | SCAC4 |
| 9943 | PTTH | P T TRANSFER | | | SCAC3 |
| 9944 | PTTI | PORT TERMINAL TRANSPORTATION INC | | | SCAC3 |
| 9945 | PTTI | PETROLEUM TRANSPORT INC | | | SCAC4 |
| 9946 | PTTJ | POWERLINE TRUCK TRANSPORT | | | SCAC3 |
| 9947 | PTTJ | P T | | | SCAC4 |
| 9948 | PTTL | PRIME TIME TRANSPORTATION INC | | | SCAC4 |
| 9949 | PTTM | PITTMAN TRANSPORT INC | | | SCAC3 |
| 9950 | PTTN | PINE TREE TRUCKING INC | | | SCAC3 |
| 9951 | PTTN | PRATT TRANSPORT | | | SCAC4 |
| 9952 | PTTO | PETROLEUM TRANSPORT INC | | | SCAC3 |
| 9953 | PTTP | PRO TRANSPORT TAMPA INC | | | SCAC4 |
| 9954 | PTTQ | PORTSMOUTH TERMINALS INC | | | SCAC3 |
| 9955 | PTTS | PETROLEUM TRANSPORT SERVICES INC | | | SCAC4 |
| 9956 | PTTT | PORT TERMINAL TRANSPORT INC | | | SCAC3 |
| 9957 | PTTU | PARITET LTD | | RUS | BIC |
| 9958 | PTTU | TRIKORA LLOYD, P.T. KERR CO. | | | SCAC3 |
| 9959 | PTTV | PANORAMA TOUR & TRAVEL INC | | | SCAC3 |
| 9960 | PTTW | PORT OF TACOMA | | | SCAC3 |
| 9961 | PTTW | PST TRANSPORT INC | | | SCAC4 |
| 9962 | PTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 9963 | PTTX | Trailer Train Co. | added 10/1964; 7/1965-1/1980; eliminated 1/1992 | | NAKINA |
| 9964 | PTTX | Pensacola Tar & Turpentine Co. | 8/1920-7/1923 | | NAKINA |
| 9965 | PTTX | Trailer Train Co. | added 10/1964 | | NAKINA |
| 9966 | PTTX | Trailer Train Co. (FMS flat cars specially equipped with bulkheads 48'6"" apart, to provide for loading of wallboard, plywood, etc.) | 7/1965-10/1968 | | NAKINA |
| 9967 | PTTX | Trailer Train Co./TTX Co. (flat cars equipped with bulkheads, spaced 48'6"" apart, for transporting plywood, wallboard, etc.) | 4/1970-1/1994 | | NAKINA |
| 9968 | PTTX | TTX Co. (flat cars equipped with bulkheads, spaced 48'6"" apart, for transporting plywood, wallboard, etc., equipped with end of car cush.) | 7/2000 | | NAKINA |
| 9969 | PTTX | Trailer Train Co. | Jul-65 | | NRHS |
| 9970 | PTTX | Trailer Train Co. (FMS flat cars specially equipped with bulkheads 48'6" apart, to provide for loading of wallboard, plywood, etc.) | 10/66-10/68 | | NRHS |
| 9971 | PTTX | Trailer Train Co. | Apr-70 | | NRHS |
| 9972 | PTTX | Trailer Train Co. (flat cars equipped with bulkheads, spaced 48'6" apart, for transporting plywood, wallboard, etc.) | 1/75-1/80; eliminated 1/92 | | NRHS |
| 9973 | PTTX | TTX Co. (flat cars equipped with bulkheads, spaced 48'6" apart, for transporting plywood, wallboard, etc.) | added 1/92; 1/94 | | NRHS |
| 9974 | PTTX | TTX Co. (flat cars equipped with bulkheads, spaced 48'6" apart, for transporting plywood, wallboard, etc., equipped with end of car cush.) | Jul-00 | | NRHS |
| 9975 | PTTX | *PENSACOLA TAR & TURPENTINE CO. | | | PWRC |
| 9976 | PTTX | +TTX COMPANY | | | PWRC |
| 9977 | PTTX | TTX Corporation | | | RSRV |
| 9978 | PTTX | TTX COMPANY | | | SCAC4 |
| 9979 | PTTY | PETTY, CHARLES F & SONS INC | | | SCAC3 |
| 9980 | PTTY | PETTYS TRUCKING INC | | | SCAC4 |
| 9981 | PTU | Europe Air Charter | Callsign: Aerolux, | L | AVCODES |
| 9982 | PTU | Porr Technobau & Umwelt AG | | AT | VKM |
| 9983 | PTUA | PAUL TRUCKING | | | SCAC4 |
| 9984 | PTUB | PRIME TUBE INC | | | SCAC3 |
| 9985 | PTUC | PRATT TRUCKING CO INC | | | SCAC3 |
| 9986 | PTUC | POWERTEL UTILITIES CONTRACTORS LIMI | | | SCAC4 |
| 9987 | PTUF | PROCTOR TRUCKING | | | SCAC3 |
| 9988 | PTUH | PERSONAL TOUCH LIVERY SERVICE INC | | | SCAC3 |
| 9989 | PTUI | POLLAKIS TOURS INTERNATIONAL | | | SCAC3 |
| 9990 | PTUJ | PEARL TRANSPORTATION DISPATCH LLC | | | SCAC4 |
| 9991 | PTUK | PATTERSONS TRUCKING | | | SCAC4 |
| 9992 | PTUL | PIONEER TRUCK LINES INC | | | SCAC3 |
| 9993 | PTUM | PETROLEUM PRODUCT SALES | | | SCAC3 |
| 9994 | PTUN | PRIME TRUCKING SERVICE INC | | | SCAC3 |
| 9995 | PTUO | PRESTO TRANSPORT | | | SCAC4 |
| 9996 | PTUP | PEARSON TRUCKING | | | SCAC3 |
| 9997 | PTUQ | PREMIER TRANSPORT USA INC | | | SCAC4 |
| 9998 | PTUR | PAMERON TOURS INC | | | SCAC3 |
| 9999 | PTUR | PORTER TUCKING | | | SCAC4 |
| 10000 | PTUS | PATTERSON, BRUCE | | | SCAC3 |
