if you prefer English.
As mentioned, GLXF is a 'test' registration used by Bombardier (GL
press) and does not appear in the register. The available marks function on the TC
page shows the following GLX* marks: GLXA GLXC GLXG GLXI GLXJ GLXL GLXN GLXP GLXR GLXT GLXV GLXX GLXZ as unused yet only GLXE is actually allocated (to a balloon) so the rest of the 'missing' ones are reserved for Bombardier.