I have an upcoming business class flight from KTM to YYZ and no longer collect Asiamiles as I am focusing on other programs that I use more. I can credit the flight miles to my main programs: Air Canada, Alaska, British Airways or American Airlines. Any idea which will give me the most "bang for my buck"?
As above what will one J trip do your others ffp's. Depends on your objectives from a ffp and the current balance/status, As well how far from life time status.
With Alaska, British Airways or American Airlines ffp's you have a big overlap. All are in Oneworld.
AA & BA have a closer relationship than just Oneworld
AA & AS have a closer relationship than just Oneworld
FF miles/avios/points are not equal to earn or burn.
Each ffp has different rules for getting and maintaining status.
A map from the Great Circle Mapper - Great Circle Mapper
https://www.wheretocredit.com/cathay-pacific-airways/j