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You need to look at business class availability for the dates you want to travel on the websites of the various airlines you can transfer to. Finding three business seats during what smells like Easter/spring break times may be challenging. But that's where you need to start. You should also be aware that whatever availability you see may not be there once you transfer your points...

Late March will not be warm enough for a beach holiday in Europe, even in southern Spain. In fact, it could be wet and cool.