I suspect if you're based part time in Spain, Spanair, which joins April 1st, might be a good bet - as part of them joining they may well comp you status, specially if it's across from IB. BD might also be worthwhile, but you need to match the value of thee program to your travel patern to decide what is best. eg: Perhaps LH would be good if you fly a lot of paid C/F flights.
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RichardMEL, UA 1K
A Star Alliance Member.