Originally Posted by
Beetlesauce
Flight was marketed by Iberia and purchased on Iberia's website and ticketed by Iberia. All IB except it was flown by oneworld partner BA and BA refused to honor Iberia oneworld baggage allowance.
Unfortunately you are mistaken. Operating carrier policies ALWAYS apply and BA very definitely and clearly do not give Oneworld elites a free bag on Basic fares. (you got lucky once)
Moreover, I'm not even sure that IB publish the fact that they give OW elites a free checked bag on Basic fares. However FTers have figured this out over time. So the fact that IB marketed and ticketed the flight shouldn't have led you to believe you'd get a checked bag either.