I need your expect advice on our late September travel plans. We are flying back to LYS from YYZ on LX with our newborn child (born to a surrogate in Canada). We already have our economy flex tickets booked for both adults but we'll need to buy one for our child as we want him to have his own seat. But the one way fare only is more expensive than the return...what would happen if we buy a return fare and not use the return? Thanks for your assistance.