Note from the editor: Citi Premier® Card is no longer available to new applicants 
Citi has changed the landscape of travel reward cards by giving carriers of the Citi® Double Cash Card the ability to transfer their cash rewards to the ThankYou point program, given that they also hold either a Citi Premier® Card or Prestige Card. I'll start at the conclusion as far as what this means and work backward: The Citi® Double Cash Card now has the potential to earn 2 ThankYou Points per dollar spent on ALL purchases, with no cap on points earned.

The Citi ThankYou Premier Card is once again offering 40,000 bonus ThankYou Points after $3,000 in purchases within the first 3 months of account opening. Citi dropped the sign up bonus on the ThankYou Premier Card earlier this year, and since April the card has had no sign up bonus whatsoever.

Citi issues lots of cards that earn ThankYou Points, but not all of them earn a type of Thank You Point that can be transferred to airline and hotel loyalty programs partners like the Citi Prestige and Premier cards do.