Lost Flight AOTC quest not handed in!

I forgot to hand in [Lost Flight] after my N’zoth kill and now I can not get the NPC to spawn so I am unable to get my mount reward?

The quest turns into Wrathion in the Chamber of the Heart. So, as long as you looted the item, you don’t need to enter the raid to turn it in.

okay ty i was confused because i went to the chamber and the NPC wasn’t loading so i was confused