Buying miles is the process of purchasing frequent flyer miles directly from an airline or through its loyalty program. Rather than waiting to accumulate points from flights, hotel stays, or credit card spending, travelers can simply buy the miles they need—either to top up an account or fund an entire redemption. https://www.storeboard.com/blogs/travel/buy-miles-and-buy-krisflyer-miles-a-smart-traveler’s-strategy-for-reward-flights/6263598