I heard once it was to keep the French military jets out.
That made me chuckle
, but could actually be the reason, because the French military views the whole of France as thier playground.
Despite blocking off a fair proportion of it down here for thier sole restricted use, they seem to delight in blasting through the overhead of our little aerodrome between 500 and 1500 feet though it is probably in the only bit of free G airspace hereabouts!! Ive once been lined up on the runway when a Mirage 2000 blasted overhead on a gracefull turn at about circuit hieght and once been on downwind when 2 alfajets shot by underneath me at around 500ft - I assume(hope) the 1st of the pair saw me as he gave a little waggle on the way past....
Ive always wondered about the reason for it being Class A too
Regards, SD..