Originally Posted by
stifle
BOS-DUB is 25,000 Avios return (round-trip) in economy. You'll need an extra 18,000 Avios.
Right, so we will have to use avios + cash since I don't think we will be getting 18,000 more avios. I don't know if it is better to spread the points between the three tickets or get 2 "free" tickets and pay for the third.