A way to tell if the player is in elytra?

Exactly as the title states, I am looking for a way to tell if the player is flying an elytra such as a flag or property?
When a player is flying it shows them to others as walking. This is using @Ad5001 s Elytra plugin.
I was going to attempt a modification.

 

Maybe it's this data flag?

 

will that make the player appear to be flying with elytra rather than being upright?

 

I believe so, but the best way to be sure is to test it out.

 

After some time, I discovered something:
The player action 15 (or 14, I don't exactly remember) is used to start gliding and 16 (or 15 for the same reason) for the stop gliding.
If you feel so, you could save using a catching datapacket PlayerActionPacket.

 

Can you edit your plugin to make all players look like they are gliding?

 

PHP:

public function onWings(Player $player){
if($player->getInventory()->getChestplate()->getId() === 443){
\\ do stuff
\\ elytra goes into the chestplate slot thats why i used getChestplate()
{
{

 

That isn't useful. Sorry