| 1 | WTP | Westpoint Air | Callsign: Westpoint, | CDN | AVCODES |
| 2 | WTP | Westpoint Air | | | ICAO1 |
| 3 | WTPB | WORLD TRANSPORTATION COMPANY | | | SCAC4 |
| 4 | WTPE | WESTERN TRUCK PARTS & EQUIPMENT CO | | | SCAC4 |
| 5 | WTPN | WADDICK TRANSPORT (2003) INC | | | SCAC4 |
| 6 | WTPO | WESTERN TEXTILE PRODUCTOS DE | | | SCAC4 |
| 7 | WTPX | Western Tar Products Corp. | 7/1937-4/1938 (not listed) | | NAKINA |
| 8 | WTPX | WESTERN TAR PRODUCTS CORP. | | | PWRC |
