There's only ILS-Y approach here, and no Z approach. Does anyone know
why there's no Z?

Just a guess... maybe there was one and it was decomissioned. Changing
the names around would invite disaster (though that doesn't stop them
from changing taxiways areound)

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.