Can you earn the Citi / AAdvantage Executive bonus twice?

Credit card welcome bonuses are one of the quickest ways to earn valuable travel rewards. You can often pick up 100,000 points or more in a single bonus, which can be worth thousands of dollars in travel. Right now, American Airlines’ top-tier card, the Citi® / AAdvantage® Executive World Legend Mastercard® (see rates and fees),…