Citi brought back the best-ever welcome offer on its AAdvantage Business card: 75,000 American Airlines miles after $5,000 spend in 5 months, with the $99 annual fee waived for the first year. The headline bonus is great on its own, but the real edge for frequent American flyers is what the card unlocks inside AAdvantage Business—extra earning on tickets and, for many cardmembers, the ability to stack Loyalty Points in ways that can accelerate status.