My thoughts exactly, it would be really cool if Kai Tak launched a broader historic airport series, as there are many great ones to add, such as this one 
, Berlin Tegel (or Schönefeld prior to becoming Terminal 5 of Brandenburg and subsequently being shut down), Istanbul Atatürk or Athens Ellinikon. Many of the old airports have interesting layouts, buildings’ architecture and/or aircraft and airlines they could utilise, which is why I think this idea is really worth exploring further by the devs.