This offer is only good for today, May 18. When you sign up for the Citi / AAdvantage Mastercard, you’ll earn 25,000 bonus miles after spending $250 or more. There’s no annual fee for the first 12 months and you will also receive a free companion certificate to use on an American Airlines domestic round-trip coach-class ticket with a fare of $299 or more.

Note that this is a marked improvement over this deal since it waives the annual fee and gives you a free companion certificate.

Full details are available at http://www.aadvantage25.com/home.php.