What Cards Are Friendliest to Frequent Fliers?

“FOR millions of travelers, credit card reward programs are the best
way to score free airline tickets and hotel rooms. But with credit
card issuers and travel companies ratcheting up the competition for
customers in recent months – for instance, JetBlue recently rolled out
a new card with American Express – how do you know which card in your
wallet is worth reaching for?”
Link: nytimes.com