| 1 | DAU | Dau Air Verwaltungs AG | IATA: D5, Callsign: Dauair, Ceased operations on 16 August 2006. | D | AVCODES |
| 2 | DAU | Dauair | IATA: D5 | | ICAO1 |
| 3 | DAU | Dau Eisenbahn-Straßen und Tiefbau GmbH | | DE | VKM |
| 4 | DAUF | DAUFELDT TRANSPORT INC | | | SCAC4 |
| 5 | DAUGS | Daugavpils Satiksme | City: Daugavpils | LV | TRAFFIC |
| 6 | DAUL | DAUL, W. N | | | SCAC1 |
| 7 | DAUM | DAUM LLC | | | SCAC4 |
| 8 | DAUP | DEAL AUTO TRANSPORT | | | SCAC4 |
| 9 | DAUS | DONS AUTO SALES & TRANSPORT | | | SCAC4 |
| 10 | DAUT | DEPENDABLE AUTO TRANSPORT LLC | | | SCAC4 |
