So I'm using the United self check-in at LaGuardia airport, and the lady beside me asks me how to use the machine. I tell her that you need a credit card to validate your identity, and she pulls out a Black American Express card!! I've heard these are very rare, only a handheld # of celebrities and very wealthy people have them, but never believed it. I sad "wow, I've never seen a Black AmEx before!" She responded with "it's for business," and instantly began fumbling in her purse like she was ignoring me. I was late for my flight so I had to run. Wonder who she was? More importantly, I wonder why black AmEx cards exist. (it was 5am, but I am absolutely sure it was a black AmEx). Anyone else ever seen/heard of these?