Originally Posted by
Yllanes
If the flight is operated or marketed by BA you do not get any free checked baggage with status on a Basic fare. With IB or AA you do, but not with BA (there are reports of agents allowing a free bag or even two at outstations, like it seems happened to you in BOS, but the rule is that you have to pay).
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.
My beef with them at LHR airport was that I'd just flown BOS to LHR on IB marketed and BA operated basic economy flight and agent never even questioned or required a luggage fee as I was OW sapphire. Then in London, they demanded a fee.