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I read that the Business US Air card is dead, and I'm sad about it, but it is what it is. I'm debating whether to poke the Citi bear to ask about their AA Biz card for their 50k bonus.
I've been happy with my Citi AA Business card. They were moderately generous with starting CL and zone 1 boarding (Barclay US Air gets you group 2 boarding) so if you don't have the Elite status, it is a nice benefit. I was really surprised when it showed up without EMV, it is the only Citi card I am aware of that doesn't have EMV...