clear @a[x=25.5,y=32,z=108.5,dx=-17,dy=10,dz=-18,scores={onGround=1..},tag=!elytraFirework] elytra
clear @a[x=71.5,y=26,z=145.5,dx=7,dy=4,dz=3,tag=!elytraFirework] elytra 
tag @a[x=11,y=73,z=-17,dx=-24,dy=18,dz=25,scores={onGround=1..}] remove elytraFirework
clear @a[x=11,y=73,z=-17,dx=-24,dy=18,dz=25,scores={onGround=1..}] elytra
clear @a[x=11,y=73,z=-17,dx=-24,dy=18,dz=25,scores={onGround=1..}] firework_rocket