I understand this rule is for credit cards, not charge cards.

So, 10 days ago I applied for a business credit card, approved.
4 days ago applied for targeted Delta personal card, approved.

I want to apply for a different Delta personal card (also targeted) before Nov 8 deadline - will it be considered 3/90 or is the business card counted separately?

And, I'd like to apply for a personal Platinum Charge card in December, or am I expecting too much?

Been with AMEX about 15 years and have SPG personal for many years.