Yes — if you hold the The Platinum Card® from American Express, you can access a Delta Sky Club lounge when flying on a same-day ticket on a Delta Air Lines-operated or Delta-marketed flight (or on a flight operated by WestJet with a 006 ticket number).
However, note:
If you want, I can check the exact guest access rules (cost for guests, how many) for you. Or you can call their support at 877-297-0699.
However, note:
- Access is limited to 10 visits per Medallion year (Feb 1–Jan 31) for Platinum Card holders.
- To unlock unlimited access, you must spend $75,000 in eligible purchases on your card in a calendar year.
- Access is not allowed if your flight ticket is a Basic Economy or a similar restricted fare.
If you want, I can check the exact guest access rules (cost for guests, how many) for you. Or you can call their support at 877-297-0699.