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That has to be the most expensive AF out there. I tried to look up the benefits once and couldn't find anything. What does $595 really get you beyond a nice looking card??
Google came up with a list from another credit card site, "The benefits guide (book) is a staggering 57 pages long" so needless to say it has a few benefits, and its most likely a hidden TL like other JP Morgan cards, so it gives you freedom and flexibility to live your life not worrying about posting dates, reporting dates and not tank your FICO score because you bought a porsche 2 days before you closing of your penthouse suite in New York.
I beleive the most expensive AF is the Centurion (Black AMEX) $2500 AF
And reports of many other things that aren't official benefits (Global Entry reimbursement, airline incidentals reimbursement, etc.).