혹시 뒷북일지도...
안 보이는 것 같아 올렸어요...
https://www.usairways.com/en-US/dividendmiles/programdetails/purchasemiles/buymiles.html?CAMPAIGNCODE=USB100CJtextlink
출처)
http://blog.frequentflyerbonuses.com/
예전에 마일모아님이 올리신 글 링크해요.
http://www.milemoa.com/2012/03/15/usair-purchase-transfer-promo/