Originally Posted by
B747-437B
If you don't get the voucher in Washington, just go to the Transit desk in Addis and they will print them for you there. You have to go to the Transit desk anyway to collect your hotel assignment (which will be almost certainly the Hilton for you traveling in Cloud Nine), so this won't take any extra time.
Excellent point and thank you for saving my time at IAD. Happy Holidays!