Travel rewards credit cards issued by major banks can be an option for you. Such cards allow earning miles on all purchases and you can redeem them without restrictions. For example, the Discover it® Miles credit card will allow you to redeem bonus miles with any airline including British Airways. To redeem miles, you simply need to buy a ticket with the card and then log in to your online account to redeem your miles. Discover card will reward you with 1.5 miles for every dollar you spend. There is no annual fee and no foreign transaction fees, so you can freely use the card abroad.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.