detect_moving_entity.mcfunction

# run each tick 'execute as @e[] run namespace:detect_moving_entity'
# then execute as @e[tag=takeoff] ...
# the `flying` tag is present even in `takeoff` and `landing` phases

tag @s[tag=flying, tag=landing] remove flying
tag @s[tag=landing] remove landing

tag @s[tag=flying, tag=!landing, nbt={Motion:[0d,0d,0d], OnGround:true}] add landing

tag @s[tag=takeoff] remove takeoff

tag @s[tag=!takeoff, tag=!flying, tag=!landing, nbt=!{Motion:[0d,0d,0d]}] add takeoff
tag @s[tag= takeoff, tag=!flying, tag=!landing, nbt=!{Motion:[0d,0d,0d]}] add flying