This is the first time I hear such a thing as an EASA pilot.
I believe this "Class A" nomenclature came from a very old ICAO categorization that's no longer in use (maybe except in Korea?) The table can be found in ancient copies of ICAO Annex 14. It has since been replaced by a two element Aerodrome Reference Code, consisting of a number and a letter (e.g., 1B or 4F).
ICAO replaced this table with the Aerodrome Reference Code maybe around 30 years ago? Perhaps best to ignore it unless studying for the Korean Air Law exam.