Originally Posted by
longliveKA
True, some mistakes in there.
I'll revise, complete and try to make it bigger.
For US, IB doesn't even mention them on their website... it seems the accrual rates and fare classes are something of a State secret for IB. Some of their phone operators don't even know what these are, or where to find them.
I believe, US is under AA, and AA flights would earn 100% mileage in full fare and 80% for all other economy classes, just like BA since they're all in some tri-agreement transatlantic alliance now. IB flights earn 80% for all other economy fares on AAdvantage too.
I think only on BA do IB members earn 100% miles on all fare classes since they're owned by the same company.