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I can also confirm that PP included with CSR includes unlimited guests.
When traveling for work with 3 coworkers, all 4 of us got in on my PP when our flight got delayed at LAX.
I was the hero that day. Free food, drinks, and shower (we were stuck in the airport for 6 hours after a long day of work). The lounge was very handy!
I did mine on the benifits page on the 12/13. Got it in the mail on 12/21
It was a single page letter. All the other ones I have gotten come in a large envelope with all of the details... Unless they are just sick of sending them to me. haha