A3 segment run in style - how to determine booking class?
It seems to become more and more difficult to figure out the actual booking class when bookings flights via airline websites (e.g., LH, SK). How does this work on A3? If I'm doing a segment run and want to be able to upgrade, I need to avoid booking classes U, P and T - which is kind of hard if I don't know which booking class I'm actually buying.
I suppose an indirect way of going about it is comparing the miles shown for the "go light" or "saver" fare with the "flex" fare - if the miles are the same, then the booking class should be upgradeable. Is that correct, and is there a different/better way of figuring this out/forcing specific booking classes? I suppose one can always go via the A3 call center (particularly since one needs to call them anyway to upgrade), but will that trigger an additional charge?