Originally Posted by
IsleOfMan
You may have to pay the small additional taxes/fees associated with adding a connection and the airport you're adding the connection through. The times I've done this, it's been in the ~$5-$12 range.
Not with SDC you don't. You only pay the $50 or nothing.
You only pay the new PFCs when you actually require a refare. Ie paying to upgrade to a higher fare bucket in order to SDC instead of SDS when your original fare class isn't available.