V-Flyer

If a traveler is using am American (USA)-issued AmEx Plat card (no Priority Pass) to access a Delta Crown Room but the traveler is on a NRSA ticket (S3C, travel comp., yield fare ticketed); Can the traveler access the Crown Room?

Sure you can:

https://www124.americanexpress.com/card ... its&show=0

Airport Club Access Program Ñ complimentary admission
Wait for your flights in the comfort of a private airport club. Platinum Card membersÑas well as their spouses and children under the age of 21 or up to two traveling companionsÑcan enjoy complimentary access to participating Continental Airlines Presidents Club¨, Delta Crown Room Club¨, and Northwest Airlines WorldClub¨ locations worldwide when traveling with the respective airline that is operating the club.

Thanks,
Richard