La commande pour big jump:

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 ~2 stained_hardened_clay 11 hollow},{id:MinecartCommandBlock,Command:fill ~2 ~-2 ~-1 ~8 ~-2 ~2 stained_glass 9 0 stained_hardened_clay},{id:MinecartCommandBlock,Command:fill ~3 ~-2 ~ ~7 ~-2 ~1 chain_command_block 5},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~1 chain_command_block 4},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~ chain_command_block 3},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 13},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ repeating_command_block 5},{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~1 {auto:1,Command:execute @a[score_jump=3] ~ ~ ~ scoreboard players reset @a jump}},{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~ {auto:1,Command:execute @a[score_jump=1] ~ ~ ~ particle largesmoke ~ ~-.5 ~ 0 -.5 0 0.01 5 true}},{id:MinecartCommandBlock,Command:blockdata ~6 ~-2 ~ {auto:1,Command:execute @a[score_jump=1] ~ ~ ~ effect @p minecraft:levitation 1 3}},{id:MinecartCommandBlock,Command:blockdata ~5 ~-2 ~ {auto:1,Command:execute @a[score_jump=0] ~ ~ ~ effect @p minecraft:levitation 0 0}},{id:MinecartCommandBlock,Command:blockdata ~4 ~-2 ~ {auto:1,Command:"testfor @a {Inventory:[{Slot:102b,id:minecraft:elytra,tag:{display:{Name:\\\"JetPack\\\"}}}]}"}},{id:MinecartCommandBlock,Command:blockdata ~3 ~-2 ~ {auto:1,Command:scoreboard objectives add jump stat.jump jump}},{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]}]}]}]}

ciao!!!!