Will try to book one of these awards later this week, but I am running up against really high fuel surcharges or lack of J award availability.

Three quick questions.

Is there a list somewhere showing which Oneworld partners charge the lowest to highest fuel surcharges? (Basically I am trying to find a ticket back from South America to Asia, and the transatlantic options seem really expensive in terms of YQ, but at the same time, I can't find any award space on AA, CX or JL via the Pacific.)

If I have a J award ticket and the only award space I can find at the time of ticketing is premium economy for one of the segments, can I still change it to a business class seat if space opens up after ticketing (and after travel has commenced)?

Can I hold the award reservation for a few days before I actually ticket (I'm aiming to start travel in mid July)?

Thanks