| 1 | HEW | ASA Heli-Water Sp. z.o.o. | Callsign: Heliwater, | PL | AVCODES |
| 2 | HEWG | HEWINGS TRANSPORTATION INC | | | SCAC4 |
| 3 | HEWH | HOWERTON, E W HAULING INC | | | SCAC4 |
| 4 | HEWS | HEWSAW MACHINES INC | | | SCAC4 |
| 5 | HEWT | Houston East & West Texas Ry. | 4/1938-7/1954 | | NAKINA |
| 6 | HEWT | Houston East & West Texas Ry. (Southern Pacific Lines in Texas and Louisiana) | 8/1920-7/1936 | | NAKINA |
| 7 | HEWT | Houston & Shreveport R.R. (Southern Pacific Lines in Texas and Louisiana) | 8/1920-7/1923 | | NAKINA |
| 8 | HEWT | Houston East & West Texas Ry. | 4/38-1/52 | | NRHS |
| 9 | HEWT | HOUSTON EAST & WEST TEXAS RAILWAY | | | PWRC |
