Originally Posted by
eponymous_coward
My reaction is kinda “eh”. FI isn’t generous with AS miles on the earn side and redeeming for coach on a WW plane with tight pitch and carrier surcharge doesn’t exactly send tingles down my spine. Assuming they even do that (for an LCC they might well have good reason not to fully merge the carriers: you don’t earn AS miles on LEVEL even though they are owned by the same company that owns BA).
Even more relevant example is DE and MT. Both budget airlines owned by the Thomas Cook Group, both serve AS hubs, but DE is an AS parter and MT is not. Hard to understand the rhyme or reason for some of these choices.