Elytra can be repeatedly used on flat ground to gain speed

While jumping on flat ground, a player can activate their elytra right before they touch the ground, allowing them to then leap forward with extra momentum from the momentary glide. This process can be repeated to create a very bizarre-looking form of "bunny-hopping".

Since 1.15, players can activate elytra while jumping upward, making this movement even easier to perform. It's unclear whether this kind of movement  with elytra on flat ground is intended.