I had tickets to STX in December and just changed to go to a different island. The waiver policy is clear but it's YMMV with the agent on the phone - incredibly frustrating!
If you keep your destination island the same, then you can change the dates and not pay anything extra. If you go elsewhere, you pay the difference in fare of the new ticket. The $200 change fee is waived in either case.
You need to HUACA if the agent gives you pushback. Some claim the waiver only applies for flights from last month; others claim you can't change your destination. Eventually you will get one who knows what they're doing. It was bad enough doing this with the Platinum line - I can only imagine how awful it must be through the general number!
