[ardikus]

I think that Jon could very likely be Azor Ahai if a few of these assumptions are true -

1. Azor Ahai is the same thing as the "Prince that was Promised"

2. Jon is the legitimate son of Rhaegar and Lyanna, meaning they were wed and had Jon, making him a Targaryen prince.

If Jon is a Targaryen prince, then it's not a huge leap to make him the "Prince that was Promised" because of the repeated phrase "Promise me, Ned" from Lyanna.

So if R+L=J, and PtwP = AA, then Jon = AA.