FLB Fly Like Birds

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:/scoreboard objectives add Plane stat.aviateOneCm},{id:MinecartCommandBlock,Command:fill ~3 ~-2 ~ ~12 ~-2 ~ chain_command_block 5},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ repeating_command_block 5},{id:MinecartCommandBlock,Command:blockdata ~12 ~-2 ~ {auto:1,Command:/scoreboard players tag @a[tag=flyb] remove flyb}},{id:MinecartCommandBlock,Command:blockdata ~11 ~-2 ~ {auto:1,Command:/execute @a[tag=flyb] ~ ~ ~ /kill @e[name=Fly,c=1] }},{id:MinecartCommandBlock,Command:blockdata ~10 ~-2 ~ {auto:1,Command:/scoreboard players tag @a[tag=flyb] remove Fly}},{id:MinecartCommandBlock,Command:blockdata ~9 ~-2 ~ {auto:1,Command:/scoreboard players tag @a[tag=Fly] add flyb {OnGround:1b}}},{id:MinecartCommandBlock,Command:blockdata ~8 ~-2 ~ {auto:1,Command:/execute @a[tag=Fly] ~ ~ ~ /teleport @e[name=Fly,c=1] ~ ~ ~ }},{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~ {auto:1,Command:/scoreboard players tag @a[tag=fly] remove fly}},{id:MinecartCommandBlock,Command:blockdata ~6 ~-2 ~ {auto:1,Command:"/execute @e[tag=fly] ~ ~ ~ /summon Giant ~ ~ ~ {CustomName:\\\"Fly\\\",NoGravity:1b,Invulnerable:1,PersistenceRequired:1,NoAI:1,Silent:1,ActiveEffects:[{Id:14,Amplifier:0,Duration:20000000,ShowParticles:0b}]}"}},{id:MinecartCommandBlock,Command:blockdata ~5 ~-2 ~ {auto:1,Command:/scoreboard players tag @a[tag=fly] add Fly}},{id:MinecartCommandBlock,Command:blockdata ~4 ~-2 ~ {auto:1,Command:/scoreboard players set @a[score_Plane_min=1] Plane 0}},{id:MinecartCommandBlock,Command:blockdata ~3 ~-2 ~ {auto:1,Command:/scoreboard players tag @a[score_Plane_min=1,tag=!Fly] add fly }},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 0 {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}