Just be very carefull with flight choice ... they would not match me for full fare Y ticket RT PRG-CDG-LIS because despite being OK coded, CDG-LIS is of course operated by AF. However, they said nothing back than in rules about operating carrier, just mentioned 100% earning flights.
They won't give you legitimate reason, more like "because we said so".
However they had no problem matching with cheap PRG-WAW one way ticket...funny but I think it illustrates wholesituation about CSA...
Not sure. My BA Gold got me a CSA Gold 2yrs ago when CSA stopped London and I found myself a few flights short of getting the card simply through flights. I'd held a CSA Gold for a number of years before and now retain it under its own steam. I was hoping for a Plat'm but no luck. Mrs CC had a BA silver and got a CSA silver for the same reasons