Also interesting how old this system is and how everything is assigned once and never updated. Saint Petersburg airport is LED because the city was called Leningrad at the time the codes were assigned. Aeroflot, the largest Russian airline, has code SU, most probably because Soviet Union, and because it was the only Soviet airline.
One I always liked was Finnair's AY, as its original name was Aero oY. OY being Finnish for Limited Company, like AG in German, or AB in Swedish.
As both Finish and Swedish are official languages in Finland that allows for the cleverly named lock company ABLOY. This stands for AB Låsfabriken Lukkotehdas OY, i.e. "Corp. Lock Factory Lock Factory Corp." in Swedish then Finnish.
