Hi!

I'm usually a Delta flyer and not so familiar with AA procedures.
I'm flying with my family from JFK-PUJ in a few weeks. I'm considering upgrading with points for the 3 of us as a special treat.
We purchased as N fare tickets.

Some questions:

1. If I upgrade to business, do we get lounge access?
2. Can I do this easily on the website? I only seem to see an option to upgrade with $.
3. Is there some possibility of using Chase ultimate rewards or AMEX points to upgrade?

Thanks so much!!