Originally Posted by stephem

Don't forget that for pretty much any transatlantic fare, IB, BA and AA will usually file a similar or exact fare, but also, you can get pretty much any transatlantic flight, whether BA/IB/AA operated with a BA/AA/IB code. So you can get a BA issued ticket with BA coded AA metal (say LHR-DFW or LHR-LAX). That is ideal for running up maximum RDMs. By the same token, you can get all AA flight #s (even on BA metal) to take advantage of 2x EQM if you care more about EQMs.