Sorry if this question has been asked. I am new to the world of using miles to upgrade (as I know have the miles to do so) . Not to sure how early/late to do this and do have a few questions below, so thanks for the help


I am flying EWR-HKG on CO . The fare class is B.

I would like to use my NWA points to upgrade the flight from Y to C.

#1 How many miles do I need to do so? 12,500 or 25,000

#2 How do I go about upgrading, do I call CO or NWA?

#3 How long will it take to know if I can upgrade the ticket?

#4 Does CO or NWA issue me a new ticket if it has been done, will requesting an upgrade cause a problem to my ticket?

#5 Most importantly, am I able to earn any miles if I upgrade the ticket?

Thanks for the help