Can you ride the great leonopteryx again in avatar the game

I have completed both campaigns, RDA and Na'Vi. I have found the gunship dragon at the end of RDA Campaign but no Leonopteryx at the end of Na'Vi. Apparently if you can somehow get back to the dormant well of souls, it is still sitting where you landed it but I can't get there to find out. So far it is impossible to ride after the last mission. Hope this helps