Great news for those of you eyeing a big stash of American Airlines miles! The CitiBusiness American Airlines Platinum Select World Elite Mastercard is once again offering a welcome bonus of 75,000 AAdvantage miles after you spend $5,000 within the first five months. This is a solid offer, putting it back on our radar as one of the best airline card bonuses available right now. The annual fee is waived for the first year, which is a nice perk. Why does this matter to you? Well, 75,000 miles can get you a significant chunk of the way toward a dream vacation, whether it's a few domestic flights or even an international adventure. Keep in mind the fine print: Citi has a rule that limits you to one American Airlines bonus every 48 months, so make sure you are eligible. Also, some sources are suggesting this offer might be around for a limited time, though an end date hasn't been specified, so if you're interested, don't wait too long to apply!