Do I need a visa flying from Boston to Shanghai if I have US passport and home return permit?

I was born in HK and then immigrated to US. I have HKID card, home return permit 港澳居民來往內地通行證, and US passport. I do not have HKSAR passport.

If I want to fly direct from Boston to Shanghai, would I still be able to board the plane without the entry permit?
When I arrive at Shanghai, do I only show home return permit?

Thanks.