It's most certainly possible as a WP. I've done exactly that on several occasions over the last few years, usually for 2 seats. It seems a bit harder to request when the flights are a long way into the future, but we've had good success having seats opened up for flights leaving within the next 2 weeks.
Thanks for that info! I've never thought of asking mainly because when we go to the request stage of the call, the rep always asks "business or premium?"
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