The US Airways Premier World MasterCard offers bonus miles, a roundtrip companion certificate and exclusive features all year long. You can earn up to 40,000 bonus miles after your first purchase and payment of the annual fee. You can also redeem flights for 5,000 fewer miles and enjoy receiving a companion certificate good for round-trip travel for up to 2 companions at $99 each. You can earn 2 miles per every dollar spent on US Airways purchases and earn 1 mile per every dollar spent everywhere else.
Note that this card carries an $89 annual fee.