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You can earn miles by joining one of the frequent flyer programs offered by Star Alliance member airlines. There are 28 airlines in the alliance, including United Airlines which is a major U.S. airline. You can join any frequent flyer program and start earning miles within the whole alliance. There is no additional Star Alliance card, you will have a membership card issued by the airline you join and this card will be recognized by all members.
We recommend you to consider travel credit cards that are more flexible in earning and redeemding rewards.