United has had targeted offers out there for an increased bonus for its United Explorer credit card for a while, and they seem to come and go – they’ll work for a while then stop.

My wife just received a targeted offer in the mail for 50,000 miles after $1,000 spend in 3 months; and 5,000 miles for adding an authorized user (this offer has been around in some form). Some people have had trouble with other URLs. Try this one: unitedexplorercard.com/50kbonus and see if you get the increased offer. Log in to your United account before going to the link.

The terms say it’s good through January 15, 2013.

(In case you were interested and not targeted, the regular 30k bonus offer is available here in my affiliate link that you are more than free to ignore).