Miles Booster is a benefit available to all Flying Club members and gives you the choice of buying the base flown miles, or buying double the base flown miles for a trip you’re taking on Virgin Atlantic. You can also retroactively boost for flights you’ve flown over the last 6 months. Purchasing miles through Miles Booster will cost you about $.016 per mile. This is a much better deal than just buying miles outright from Flying Club. Purchasing miles will run you about $.0275 (if you buy a lot) to about $.52 per mile.