| 1 | PRP | PRT Aviation, S.L. | Callsign: Pronto, | E | AVCODES |
| 2 | PRP | PRT Aviation | | | ICAO1 |
| 3 | PRPA | PRONTO PARCEL | | | SCAC3 |
| 4 | PRPB | PRODUCE TRANSPORT LLC | | | SCAC4 |
| 5 | PRPC | PROSPECT CARTAGE COMPANY INC | | | SCAC3 |
| 6 | PRPD | PREFERRED TRANSPORT&DISTRIBUTION, INC | | | SCAC3 |
| 7 | PRPD | PREFERRED TRANSPORT & DISBRIBUTION | | | SCAC4 |
| 8 | PRPE | PROFFER PRODUCE EXPRESS INC | | | SCAC3 |
| 9 | PRPE | PROFFER PRODUCE EXPRESS INC | | | SCAC4 |
| 10 | PRPG | PATRIA PACKAGING INC | | | SCAC3 |
| 11 | PRPI | PREMIUM PROCESSORS INC | | | SCAC4 |
| 12 | PRPJ | PRP LOGISTICS INC | | | SCAC4 |
| 13 | PRPL | PURPLE SAGE TRUCKING | | | SCAC4 |
| 14 | PRPM | PERMIAN PETROLEUM CO | | | SCAC3 |
| 15 | PRPN | PROPANE TRANSPORT, INC | | | SCAC3 |
| 16 | PRPN | PROPANE TRANSPORT, INC | | | SCAC4 |
| 17 | PRPQ | PRISE PIGGYBACK SERVICE | | | SCAC3 |
| 18 | PRPQ | PORT-PASS INC | | | SCAC4 |
| 19 | PRPR | PRO PETROLEUM INC | | | SCAC4 |
| 20 | PRPS | PARAY EXPRESS | | | SCAC4 |
| 21 | PRPT | PRUETT PETROLEUM | | | SCAC4 |
| 22 | PRPV | PRECISION TRANSPORT SERVICE INC | | | SCAC3 |
| 23 | PRPW | P R ENTERPRISE INC | | | SCAC4 |
| 24 | PRPX | Pacific Railroad Preservation Association | 7/2005 | | NAKINA |
| 25 | PRPX | Union Tank Car Co. | added 10/1953; 7/1954-10/1957; eliminated 7/1958 | | NAKINA |
| 26 | PRPX | Transit Co., Ltd. | 7/1930-1/1952; eliminated 10/1953 | | NAKINA |
| 27 | PRPX | Transit Co., Ltd. | 4/38-1/52; eliminated 10/53 | | NRHS |
| 28 | PRPX | Union Tank Car Co. | added 10/53; 10/57; eliminated 7/58 | | NRHS |
| 29 | PRPX | *UNION TANK CAR CO. [TRANSIT CO. LTD.] | | | PWRC |
| 30 | PRPX | +PACIFIC RAILROAD PRESERVATION ASSOCIATION | | | PWRC |
| 31 | PRPX | Pacific Railroad Preservation Association | | | RSRV |
| 32 | PRPX | PACIFIC RAILROAD PRESERVATION ASSOC | | | SCAC4 |
| 33 | PRPY | PRICE LOGISTICS | | | SCAC4 |
| 34 | PRPZ | PROCESS PLASTICS CO. | | | PWRC |
