Now through September 2, 2014, Chase has made this offer public to anyone, also throwing in $50 to make it sweeter: you will get $50 statement credit after your first purchase; you need to spend $2,000 within first 3 months to get 50,000 miles and if you add an authorized user and make the first use you will have another 5,000 miles. Note that if you spend $25,000 a year, you will get another 10,000 miles on your anniversary, which is a standard feature. After the landing page, you need to log into your United account. If you don't have one, spend 2 minutes to create one.
Landing Page for 55K +$50 offer