My complaint about this and other mods about flying vehicles is controls, now I do understand that modders can't do anything about it, but Mojang must help them out with this.
Credits: JPlaysPE
How to find an UFO in MCPE
- UFO replaces Skeleton, they can spawn almost anywhere in the Overworld.
- UFOs won't fly around, in fact they will move on the ground, until you use Light Blue Egg on it (Egg).
- To enter the flying saucer, make a long press on the UFO and press "Ride".
- After throwing Light Blue Egg in it, you will start gaining altitude very quickly, up to the vertical end of the world.
- To control saucer in the air, use a Key (Carrot on a stick).

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[media=https://www.youtube.com/watch?v=SEzgBEe5Qao]
How to install addons:
- Download addon into your device
- Find and open .mcpack or .mcworld files that you download earlier
- Click on it to import into Minecraft Pocket Edition
- Open the game
- Create new or edit an existing world
- Scroll down to Add-ons section and select the ones you want to apply