| Version | 2 |
| Created | 12/31/2015 21:36 |
| Last Updated | 09/03/2023 18:03 by Alexander Lennon |
Pre-Departure Clearances, or PDCs, are sent to pilots using a program called vTDLS. Using vTDLS, controllers can send PDCs to pilots. It is also possible to send clearances to pilots who have prefiled before they connect to the network. vTDLS is only available for usage at SEA and PDX; all other airports in ZSE require the usage of voice clearances (which may be sent via text if the aircraft is text only).