Savvy frequent travelers know that loyalty to a specific airline can translate to big savings on flights and upgrades. But not all loyalty programs work the same or have equal benefits. 

So, we asked miles-and-points experts to nominate the nation's most worthwhile programs — those with plenty of ways to earn and redeem miles, great coverage, and an abundance of flight options when it comes time to book that free trip. Then, readers voted for their favorites to help crown the winners.

Here are the 10 best frequent flyer programs.