Via Doctor of Credit, there is a new increased offer for the United MileagePlus Explorer credit card. This offer is targeted, so you will need to login to your United MileagePlus account to see if it is available to you.
This offer, which ends on 6/30/16, includes 70,000 miles after spending $3,000 in 3 months and an additional 5,000 miles for adding an authorized user and having them make a purchase during that same period. A $50 statement credit is included as well.
The annual fee of $95 is not waived during the first year.
Note that Chase will likely not approve your application if you have opened 5 or more credit cards in the past 24 months. If you can pass that requirement, I highly recommend this card, as this is the highest bonus we have ever seen.