Originally Posted by
deal
In the past, I've been warned against cancelling the placeholder flight as it would forfeit the credit. I have never tested it to verify.
However, I have used a placeholder flight and changed it to a new date for this purpose. If you're confident of a route you'll fly but just not sure the dates, then this is definitely a good workaround.
I wouldn't be concerned about the routing, you can change that online, too. I would, however, book something with a connection rather than a non-stop. The extra segment in the itinerary makes online changes easier and affords more flexibility.
James