Originally Posted by
GetSetJetSet
I know some carriers have low Y class buckets that don't earn, but I don't think BA or AA have any buckets that earn 0% other than award tickets. So this sounds like some sort of scam where a company pays someone to use their miles. I'm not sure how legal it is, but consult someone with more intimate knowledge of FF program rules. If you run afoul of them you can end up screwing yourself.
Could it be a consolidator fare? If it's some sort of award ticket from purchased miles, don't even think if using it. If caught, you could be stranded and forced to buy a full fare one way ticket to get home.