Originally Posted by roki

Prestige cards still earn flight points, AFAIK.

"Fly:
When you travel, you'll earn Flight Points for every mile flown on any airline"
-https://online.citibank.com/US/JRS/portal/template.do?ID=ThankYouPrestigeCard

Also, keep in mind you can get one card and add an authorized user, and both the primary and the AU get a companion ticket. The AU has a fee, but not as much as 2 cards.