Infinite Elytra

summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false},{id:MinecartCommandBlock,Command:"fill ~2 ~-3 ~-1 ~8 ~-1 ~1 stained_hardened_clay 9 hollow"},{id:MinecartCommandBlock,Command:"fill ~2 ~-2 ~-1 ~8 ~-2 ~1 stained_glass 7 replace stained_hardened_clay"},{id:MinecartCommandBlock,Command:"scoreboard objectives add ElytraFlight stat.aviateOneCm"},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~ chain_command_block 3 replace {auto:1,Command:"/scoreboard players tag @a remove Flying {OnGround:1b}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"/execute @a[tag=Flying] ~ ~ ~ detect ~ ~1 ~ air 0 /tp @p[r=0,tag=Flying] ~ ~0.3 ~"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @a[tag=Flying] ElytraFlight 1"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"scoreboard players tag @a[score_ElytraFlight_min=2] add Flying"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ repeating_command_block 5 replace {auto:1,Command:"/effect @e[tag=Flying] minecraft:speed 5 225"}},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}