If you missed the recent 50K miles offer, there is no need to worry, you still have an opportunity for 50k miles offer if you are considering getting this card.
This Flyertalk thread keeps a record of all the active links and sometimes with higher bonuses than official offers.
You can use this link to get 50,000 bonus miles offer for Citi AAdvantage Platinum Select MasterCard. There is no guarantee about the availability of this offer, but there is always a 50K link around.
Note that AA Award chart is scheduled to change on Mar 22, 2016.
You can still sign up for 50,000 bonus miles offer for Citi AAdvantage Platinum Select MasterCard even though Citi website and AA.com are showing 30,000 bonus miles offers.
As always, make sure take a screen shot of your application before applying.
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