Hilton guests could earn mileage in partner airline frequent-flyer programs for the same stay that earned them HHonors points, a practice known as Double Dipping. (Hilton was the only hotel chain to offer double dipping; other chains with frequency programs required guests to choose between points in the hotel program or miles in the airline program.) If the member chose to double dip, HHW bought miles from the relevant airline and credited the guest's airline frequent-flyer account at 500 miles per stay.