Add the Flying AI Component to your AI, select a Behavior Tree, and you're good to go.
Preset behaviors include:
You can also build your own flying AI Behavior Tree using the Flying Move To node :)
Setup tutorial: https://youtu.be/ZXEZnVp8qmg
Number of Blueprints: 4 (three demo Flying AI Characters and the Flying Movement Component)
Network Replicated: Yes
Supported Development Platforms: Windows
Documentation: See video above