*UPDATE: This offer has expired as this card is no longer available.
The US Airways World Premium MasterCard has had a variety of sign-up bonuses over the past year. I have the card myself, having applied when the bonus was at 40k. I wish I had waited, so I could have taken advantage of the current 50k offer! This is a limited-time offer. Also, because of the US Airways/American Airlines merger, the card itself will not be available much longer. Once the two programs merge next year, any US Airways miles you’ve earned will be converted to American Airlines miles. Because of this and the ability to apply for the American Airlines branded cards, you could possibly rack up a LOT of miles.