One of most commonly discussed "plot holes" of Lord of the Rings is the eagle plot hole, where many people question why they simply didn't ask the eagles to fly to Mordor and destroy the ring since they seemingly had the ability to get in/out relatively easily, or at least easier than the protagonists impossible mission. There's arguments for and against, but that's the gist of it.
During the trek to find Emperor Duan (Yi Deng) when Huang Rong was injured, they called the eagles who responded instantly and were able to understand that they were to go to Peach Blossom Island and find Huang Yaoshi. Isn't that ability a bit ridiculous?
I can't think of any instance off the top of my head, but were there any dangers or events that happened that could have been instantly resolved by having a pair of giant eagles that appear instantly and are intelligent enough to go anywhere they've only been to once? (Forget how incredulous it is that the eagles understand Peach Blossom Island somehow, despite Guo Jing only being there once) Oh and they can fly/glide with humans for a decent amount.
Perhaps on the island they were stuck on, they could have had the eagles lead Huang Yaoshi to them?