No Elytra Boosting

Simple datapack, that disables elytra boosting with fireworks.

Elytra as an item is still available, and is still usable for gliding, but not for fast flight using fireworks.

Ideal for experiences where zooming around with an elytra would make overall enjoyement worse or subtract from it in experiences more focused on diferent transport options. 

This allows for more use of more traditional trasport, like minecarts, horses or moded modes of transport like Create mod trains.