American Airlines AAdvantage

The Delta SkyMiles program is convenient for frequent flyers based in United States cities like Atlanta, Detroit, Los Angeles, Minneapolis and Seattle, and for passengers who often travel to and from New York City. Delta Air Lines operates more than 15,000 flights each day to 1,000-plus destinations across more than 50 countries. By becoming a SkyMiles member, you'll earn miles based on the amount you pay for your flight with Delta, Delta Connection or Delta Shuttle; you can also earn miles for flying with any of Delta's multiple partner airlines, including KLM, Air France and Virgin Atlantic, among others. Those miles can be redeemed for free air travel on any participating airline or cashed in for cabin upgrades, unique experiences (such as concert tickets) or items for sale at the SkyMiles Marketplace. When you fly with Delta, you will also earn Medallion Qualification Miles, Medallion Qualification Segments and Medallion Qualification Dollars, which will help you gain access to a variety of perks through the Delta SkyMiles Medallion elite membership program. You can also earn miles on everyday purchases if you've signed up for a Delta SkyMiles credit card by American Express.

The Hilton Honors program is most advantageous for business and luxury travelers who frequently fly to and stay in major cities in the United States, Europe and Asia. Hilton Honors members can redeem points at more than 5,300 hotels and resorts across 14 different brands in more than 100 countries and territories. And because Hilton has a partnership with the United MileagePlus program (as well as more than 40 other airline and rail partners), you can cash in points for miles. Points can also be used to purchase tickets to concerts and sporting events, gift cards, cruise certificates and items sold on Amazon and Hilton Honors' shopping portal. Additionally, you can earn points for everyday purchases with the Hilton Honors credit cards from American Express.

The United MileagePlus program is best for travelers based in major American cities and those who travel to destinations in Europe, the Middle East, Australia, Latin America and Asia. When you become a MileagePlus member, you can earn and use miles on United and its 35-plus airline partners like Singapore Airlines, ANA and Copa Airlines, many of which are part of the Star Alliance network. As a MileagePlus member, you'll accrue Premier Qualifying Miles (PQMs), Premier Qualifying Segments (PQSs) and Premier Qualifying Dollars (PQDs) each time you fly. Earn enough PQDs and PQMs or PQSs and you'll reach Premier status – MileagePlus membership levels for which you'll receive extra benefits. Additionally, you can earn miles on qualifying cruise vacations, car rentals and train fares, as well as on shopping, dining and other services. You can also earn miles for gas purchases at participating BP locations in the U.S. And since United partners with major hotel brands, including Marriott, Hyatt and IHG, you can earn rewards when you stay at properties worldwide. You may also redeem miles for flights, hotel stays, cruises, magazine subscriptions, destination experiences (think: sporting events and theater performances) and more.  Choose to use one of four United MileagePlus credit cards from Chase Visa and you'll earn miles on flights and everyday purchases.