Hawaii - PHX to KOA, what airline should I fly to get Upgrade?

Hi,
Hoping for some suggestions for which airline to buy a ticket from and use miles to upgrade ticket (at least the return segments). I need to fly out of PHX on June 2nd to KOA and return on June 9th. I have thankyou points I want to use and then use miles I have with the airline to upgrade. I have enough miles with AA, DL, UA, US, and HA. Just wondering which would be best to go with and how to go about it. I would consider using miles alone to get the ticket but I've checked and they are wanting a premium number of miles at this point, for this time of year.

Thanks in advance,
Buddy1671

Since you know the dates of your travel, you can simply call the airlines and ask them if they have space availability using miles to upgrade.

I guess I'm really wanting to know which airline would be the best to fly considering I want to use miles to upgrade at least the return segments. I have silver status with Delta and they are currently the cheapest that doesn't involve an overnight in Seattle (Alaska Airlines).

I would suggest you got to the airline section of this forum and ask the same question. They can give you awesome advice and some even have access to expertfly which could help you nail down what you are looking for.

I'm sorry, I guess I'm not looking in the right places but I can't find an airline section to flyertalk unless I choose a particular airline.

I decided to go with Delta; I got a fare for $723 with a connection at LAX both ways. I used Thankyou points and called delta to get on a waitlist for upgrade using miles for the return leg. Hopefully, it will go through although I don't know much about what my chances are.