Expiry: Dec 19, 2016
From now to Dec 19, 2016, when you purchase UA miles, you could receive a bonus of up to 100% more. Just go to the above link and unwrap your own mystery offer. You can discover your special bonus when you click through and start planning your next trip.
I tried it myself, and only eligible for a bonus of up to 25% more miles on my purchase. Hope you can get 100% more bonus miles.
