So if X, Y and Z do not stand for anything, why do they not call them P, S and T? I am trying to understand the logic behind the change from P, S and T to X, Y and Z.
Thanks to all so far for contributions
Global
Because in some airports both P S T series are still operative together with X Y Z series.
In other airports where you find just X Y Z I think it's just a new way to identify the brand new procedures using final letters of the alphabet rather than using i.e. G H I that could lead to think tha there could be also a D E F etc. and you would not find the chart
In other words, it's a clear signal that it's a new procedure.
JET