Put the summary of the bug you're having here
What I expected to happen was...:
My brother and I tried jumping off a cliff with Elytra on my LAN world, just to quickly get down there.
What actually happened was...:
The fact that we had Elytra was totally ignored and we just fell like we weren't wearing any.
Steps to Reproduce:
1.Jump off a cliff
2.Fall
Related issues
Comments

The functionality was changed in snapshot 16w07a. You need to activate the elytra by jumping in mid-air.See MC-97161.