Originally Posted by
pandaperth
You've raised two basic question
pinkn
1. Can you use your BA miles to fly other airlines in the alliance?
The answer is "Yes"
How you do it is subject to the rules of the BA frequent flyer programme - see
this link to start
2. What is the best way to accrue miles when flying various airlines in the alliance?
The best way is to chose which one airline's frequent flyer programme best suits you and accrue all your miles to it (by entering your ff number for that programme into all your bookings).
Which airline is best for you will depend on your flying pattern and what you want to do with the miles you accrue (redemption flights, upgrades, shopping,...)
This thread might help
Based on the second point, am I able to fly on Qatar or on Cathay Pacific and collecting Avios at the same time instead of Qatar miles or Cathay Pacific miles? This is not 100% clear to me so I can be wrong but all I need to pay attention for is to use only one airline's ff number while booking the ticket? So even if I'm booking a ticket on qatarairways.com with Qatar and flying on Qatar, instead of receiving Qmiles, just because I entered my BA ff number I'll receive Avios to my BA account?
Sorry for my bad English!