Through March 14, US Airways is offering a 50% bonus on sharing miles.

That is, for every 1000 miles you transfer to someone’s account, US Airways will add a bonus 500.

US Airways charges 1 cent per mile to transfer miles between accounts, plus a $30 per transaction fee, and tax. With this offer you’re effectively buying miles at just over 2 cents apiece, something I wouldn’t take advantage of. When US Airways offers to sell miles at a 50% discount or with a 100% bonus, they’re selling miles for just under 2 cents apiece and I’m sort of on the fence.

However, if you need miles to top off towards an award, this is a good opportunity provided you have a friend to transfer miles from.

As with all such offers, accounts need to be open 12 days to be eligible to participate. The maximum number of bonus miles a member can receive under this promotion is 50,000. US Airways has been similarly capping their buy miles bonuses — they seem to not want someone without any miles to put an award on hold (say 100,000 miles for business class to Europe) and then just buy the miles straight out to complete the transaction.

(HT: Raden)