Originally Posted by
Often1
BA will likely properly assert that it is not liable for EC 261/2004 IDB compensation (or for the ensuing delay/cancellation compensation) because no valid ticket with a reservation existed. AA won't pay up because it was not the operating carrier and EC 261/2004 does not apply to it.
I believe this is spot on. The OP needs to pursue this with AA/in the US; BA and EU Reg. 261/04 are not relevant as the tkts were cancelled due to apparent no-show for the outbound LHR-BGO leg.