Award ticket change fee from Prem Econ to Bus/First
I need some advise, I booked a award flight from JFK - HND on Jun 23 with Prem Econ.
But the Business / First now is waiting list.
Now I have enough SPG enough to transfer to JAL to get Business/First. I want to be on this specific flight, but I want to see if the seat opens up in Bus/First.
So what option do I have? Can I be on waiting list on Bus/First and keeping the Prem Econ?
Or I have to give up my Prem Econ seat now by cancelling it and put myself in Bus/First waiting list?
Because it seems they have more seats available a few weeks out from Jun 23.
If Bus/First opens up, what process I need to do? Can I pay the differences in point / fee or I need to cancel the prem econ first and rebook it? How fast can the point re-deposit?
Thank you