The Citi Prestige Card and Chase Sapphire Reserve card also come with travel credits (both can be used for almost any travel related expense and don't have to be airline specific like the Amex Platinum's credit does.) There are a bunch of other perks and benefits that make them competitive with Amex Platinum, though maybe not if you're a Delta employee.

They obviously don't get you SkyClub or Centurion lounges, but they do come with free Priority Pass memberships for all authorized users on the card.

That said, here's the other reason for my post...

https://www.prioritypass.com/en/conditions-of-use

#18 says, in part, "Airline, airport and other travel industry employees traveling on reduced-rate tickets may not be eligible for access."

Has anyone ever tried using a Priority Pass club on a free or reduced rate ticket and been told nyet?