He won't land, I didn't know when I returned to Skyrim that Paarthurnax and Odahviing were going to talk to me. I checked the wiki because Odahviing won't land. I searched for answer for this bug but all I am finding is the trapping him part. Here is what I am talking about.

http://www.uesp.net/wiki/Skyrim:Dragonslayer#Bugs

Thanks in advance. If I don't really need him, then I will forget about him.

I figured it out. What I did was called him while in a fight. He helped me, we talked and he took off. Everything is alright now. So here's a tip for anyone who had this problem.