<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by thelostshark:
I live and work in WAS, and my flights tend not to be places where DL has a lot of flights. </font>
As a fellow Washingtonian, I'd recommend you hang on to them for a little while.... you can add United miles to a Delta account, and United has plenty of flights from their hub at Dulles.
The Hilton option will always be there..... I don't see why you need to rush. You still have 3 years to do something with the DL miles.