Elytra

When the Ender Dragon is respawned and killed by a player, it has a 40% chance to drop Elytra. This increases by 20% for each level of the 'Looting' enchantment that the player has on their weapon.

Enchantments	Drop Chance
No Looting	40%
Looting I	60%
Looting II	80%
Looting III	100%