In my stack of mail today was an offer from United for their MileagePlus Explorer Card offering 50,000 miles after the first use, 5000 miles for an authorized user on the account and then 10,000 miles for every $25,000 you spend on the card in a calendar year.
NOTE: This is not an affiliate link, I do not receive any compensation for this offer! – though a quick thanks will be appreciated!. This is the link that was in the mailer.
The link requires you to enter your MileagePlus account number. If you are not a member, there is a link to enroll.
The best offer that I have seen for this card had been a 40,000 bonus after the first use of the card. Apologies if you have already seen this offer, however this is the first time that I’ve seen it.