you can hammock the entire AT... can't hang at the huts in the whites, but, it's easy enough to avoid them and stay at the campsites/shelter areas.

Lots of pros/cons for tent vs. hammock for an AT thru hike.
I did both during my hike, mostly because my lack of winter hanging experience, and I'd have to say the hammock is a better choice IMO.

I chose to hang mainly to be off the ground.