Retro claim for Infinity MileageLands miles can be made by presenting or sending travel documentation, i.e. passenger ticket coupon and boarding pass, to the nearest Infinity MileageLands Service Center up to six (6) months after the flight is completed. Or you could claim Star Alliance mileage on Infinity MileageLands “Manage My Account”, it is not only fast but also convenient. It may take 3-4 weeks for Infinity MileageLands miles to be credited to your account after the retro claim request is made.