If you travel by air even once a year you know how expenses can quickly add up. That’s why many credit card providers offer frequent flyer airline credit cards. These cards are designed to save you money by giving back some of what you spend.

With airline credit cards, card holders are able to accumulate free mile credits through frequent flyer programs that they use toward getting free flights all over the world. Miles are earned in the same way that points are earned on other cards, for every dollar you spend you receive a mile.

Depending on the card you choose some programs offer opportunities to earn more than 1 mile on specific purchases, usually those connected to travel. The best cards will offer no restrictions on travel or expiration on the miles you earn.

In addition to miles, many airline credit cards still offer card holders the choice of other reward programs, as well as attractive terms like 0% introductory interest rates, low regular interest rates and no annual fees.

These credit cards also offer the added bonus of convenient features for travelers. Travel accident insurance, global assistance hotlines and reservation assurance programs are just some of the additional services that are offered to assist you when you’re away from home.

Airline credit cards can either be used for travel with any airline, or they can be designed with your favorite airline in mind. If you travel regularly airline credit cards will have the reward programs that give back the most while still giving you security and solid customer service.

Below are a few airline credit cards created to benefit frequent flyers.

Blue Sky from American Express

Chase TravelPlus Visa Card

Gold Delta SkyMiles Credit Card